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---
id: docs
layout: docs
title: Lodash Documentation
version: 2.4.2
---
{% raw %}
<div class="toc-container">
<div>
<h2><code>Arrays</code></h2>
<ul>
<li><a href="#compact"><code><span class="subtle-punctuation">_.</span>compact</code></a></li>
<li><a href="#difference"><code><span class="subtle-punctuation">_.</span>difference</code></a></li>
<li><a href="#rest" class="alias"><code><span class="subtle-punctuation">_.</span>drop</code> -> <code>rest</code></a></li>
<li><a href="#findIndex"><code><span class="subtle-punctuation">_.</span>findIndex</code></a></li>
<li><a href="#findLastIndex"><code><span class="subtle-punctuation">_.</span>findLastIndex</code></a></li>
<li><a href="#first"><code><span class="subtle-punctuation">_.</span>first</code></a></li>
<li><a href="#flatten"><code><span class="subtle-punctuation">_.</span>flatten</code></a></li>
<li><a href="#first" class="alias"><code><span class="subtle-punctuation">_.</span>head</code> -> <code>first</code></a></li>
<li><a href="#indexOf"><code><span class="subtle-punctuation">_.</span>indexOf</code></a></li>
<li><a href="#initial"><code><span class="subtle-punctuation">_.</span>initial</code></a></li>
<li><a href="#intersection"><code><span class="subtle-punctuation">_.</span>intersection</code></a></li>
<li><a href="#last"><code><span class="subtle-punctuation">_.</span>last</code></a></li>
<li><a href="#lastIndexOf"><code><span class="subtle-punctuation">_.</span>lastIndexOf</code></a></li>
<li><a href="#zipObject" class="alias"><code><span class="subtle-punctuation">_.</span>object</code> -> <code>zipObject</code></a></li>
<li><a href="#pull"><code><span class="subtle-punctuation">_.</span>pull</code></a></li>
<li><a href="#range"><code><span class="subtle-punctuation">_.</span>range</code></a></li>
<li><a href="#remove"><code><span class="subtle-punctuation">_.</span>remove</code></a></li>
<li><a href="#rest"><code><span class="subtle-punctuation">_.</span>rest</code></a></li>
<li><a href="#sortedIndex"><code><span class="subtle-punctuation">_.</span>sortedIndex</code></a></li>
<li><a href="#rest" class="alias"><code><span class="subtle-punctuation">_.</span>tail</code> -> <code>rest</code></a></li>
<li><a href="#first" class="alias"><code><span class="subtle-punctuation">_.</span>take</code> -> <code>first</code></a></li>
<li><a href="#union"><code><span class="subtle-punctuation">_.</span>union</code></a></li>
<li><a href="#uniq"><code><span class="subtle-punctuation">_.</span>uniq</code></a></li>
<li><a href="#uniq" class="alias"><code><span class="subtle-punctuation">_.</span>unique</code> -> <code>uniq</code></a></li>
<li><a href="#zip" class="alias"><code><span class="subtle-punctuation">_.</span>unzip</code> -> <code>zip</code></a></li>
<li><a href="#without"><code><span class="subtle-punctuation">_.</span>without</code></a></li>
<li><a href="#xor"><code><span class="subtle-punctuation">_.</span>xor</code></a></li>
<li><a href="#zip"><code><span class="subtle-punctuation">_.</span>zip</code></a></li>
<li><a href="#zipObject"><code><span class="subtle-punctuation">_.</span>zipObject</code></a></li>
</ul>
</div>
<div>
<h2><code>Chaining</code></h2>
<ul>
<li><a href="#lodash"><code>_</code></a></li>
<li><a href="#chain"><code><span class="subtle-punctuation">_.</span>chain</code></a></li>
<li><a href="#tap"><code><span class="subtle-punctuation">_.</span>tap</code></a></li>
<li><a href="#prototype-chain"><code><span class="subtle-punctuation">_.</span>prototype.chain</code></a></li>
<li><a href="#prototype-toString"><code><span class="subtle-punctuation">_.</span>prototype.toString</code></a></li>
<li><a href="#prototype-valueOf" class="alias"><code><span class="subtle-punctuation">_.</span>prototype.value</code> -> <code>valueOf</code></a></li>
<li><a href="#prototype-valueOf"><code><span class="subtle-punctuation">_.</span>prototype.valueOf</code></a></li>
</ul>
</div>
<div>
<h2><code>Collections</code></h2>
<ul>
<li><a href="#every" class="alias"><code><span class="subtle-punctuation">_.</span>all</code> -> <code>every</code></a></li>
<li><a href="#some" class="alias"><code><span class="subtle-punctuation">_.</span>any</code> -> <code>some</code></a></li>
<li><a href="#at"><code><span class="subtle-punctuation">_.</span>at</code></a></li>
<li><a href="#map" class="alias"><code><span class="subtle-punctuation">_.</span>collect</code> -> <code>map</code></a></li>
<li><a href="#contains"><code><span class="subtle-punctuation">_.</span>contains</code></a></li>
<li><a href="#countBy"><code><span class="subtle-punctuation">_.</span>countBy</code></a></li>
<li><a href="#find" class="alias"><code><span class="subtle-punctuation">_.</span>detect</code> -> <code>find</code></a></li>
<li><a href="#forEach" class="alias"><code><span class="subtle-punctuation">_.</span>each</code> -> <code>forEach</code></a></li>
<li><a href="#forEachRight" class="alias"><code><span class="subtle-punctuation">_.</span>eachRight</code> -> <code>forEachRight</code></a></li>
<li><a href="#every"><code><span class="subtle-punctuation">_.</span>every</code></a></li>
<li><a href="#filter"><code><span class="subtle-punctuation">_.</span>filter</code></a></li>
<li><a href="#find"><code><span class="subtle-punctuation">_.</span>find</code></a></li>
<li><a href="#findLast"><code><span class="subtle-punctuation">_.</span>findLast</code></a></li>
<li><a href="#find" class="alias"><code><span class="subtle-punctuation">_.</span>findWhere</code> -> <code>find</code></a></li>
<li><a href="#reduce" class="alias"><code><span class="subtle-punctuation">_.</span>foldl</code> -> <code>reduce</code></a></li>
<li><a href="#reduceRight" class="alias"><code><span class="subtle-punctuation">_.</span>foldr</code> -> <code>reduceRight</code></a></li>
<li><a href="#forEach"><code><span class="subtle-punctuation">_.</span>forEach</code></a></li>
<li><a href="#forEachRight"><code><span class="subtle-punctuation">_.</span>forEachRight</code></a></li>
<li><a href="#groupBy"><code><span class="subtle-punctuation">_.</span>groupBy</code></a></li>
<li><a href="#contains" class="alias"><code><span class="subtle-punctuation">_.</span>include</code> -> <code>contains</code></a></li>
<li><a href="#indexBy"><code><span class="subtle-punctuation">_.</span>indexBy</code></a></li>
<li><a href="#reduce" class="alias"><code><span class="subtle-punctuation">_.</span>inject</code> -> <code>reduce</code></a></li>
<li><a href="#invoke"><code><span class="subtle-punctuation">_.</span>invoke</code></a></li>
<li><a href="#map"><code><span class="subtle-punctuation">_.</span>map</code></a></li>
<li><a href="#max"><code><span class="subtle-punctuation">_.</span>max</code></a></li>
<li><a href="#min"><code><span class="subtle-punctuation">_.</span>min</code></a></li>
<li><a href="#pluck"><code><span class="subtle-punctuation">_.</span>pluck</code></a></li>
<li><a href="#reduce"><code><span class="subtle-punctuation">_.</span>reduce</code></a></li>
<li><a href="#reduceRight"><code><span class="subtle-punctuation">_.</span>reduceRight</code></a></li>
<li><a href="#reject"><code><span class="subtle-punctuation">_.</span>reject</code></a></li>
<li><a href="#sample"><code><span class="subtle-punctuation">_.</span>sample</code></a></li>
<li><a href="#filter" class="alias"><code><span class="subtle-punctuation">_.</span>select</code> -> <code>filter</code></a></li>
<li><a href="#shuffle"><code><span class="subtle-punctuation">_.</span>shuffle</code></a></li>
<li><a href="#size"><code><span class="subtle-punctuation">_.</span>size</code></a></li>
<li><a href="#some"><code><span class="subtle-punctuation">_.</span>some</code></a></li>
<li><a href="#sortBy"><code><span class="subtle-punctuation">_.</span>sortBy</code></a></li>
<li><a href="#toArray"><code><span class="subtle-punctuation">_.</span>toArray</code></a></li>
<li><a href="#where"><code><span class="subtle-punctuation">_.</span>where</code></a></li>
</ul>
</div>
<div>
<h2><code>Functions</code></h2>
<ul>
<li><a href="#after"><code><span class="subtle-punctuation">_.</span>after</code></a></li>
<li><a href="#bind"><code><span class="subtle-punctuation">_.</span>bind</code></a></li>
<li><a href="#bindAll"><code><span class="subtle-punctuation">_.</span>bindAll</code></a></li>
<li><a href="#bindKey"><code><span class="subtle-punctuation">_.</span>bindKey</code></a></li>
<li><a href="#compose"><code><span class="subtle-punctuation">_.</span>compose</code></a></li>
<li><a href="#curry"><code><span class="subtle-punctuation">_.</span>curry</code></a></li>
<li><a href="#debounce"><code><span class="subtle-punctuation">_.</span>debounce</code></a></li>
<li><a href="#defer"><code><span class="subtle-punctuation">_.</span>defer</code></a></li>
<li><a href="#delay"><code><span class="subtle-punctuation">_.</span>delay</code></a></li>
<li><a href="#memoize"><code><span class="subtle-punctuation">_.</span>memoize</code></a></li>
<li><a href="#once"><code><span class="subtle-punctuation">_.</span>once</code></a></li>
<li><a href="#partial"><code><span class="subtle-punctuation">_.</span>partial</code></a></li>
<li><a href="#partialRight"><code><span class="subtle-punctuation">_.</span>partialRight</code></a></li>
<li><a href="#throttle"><code><span class="subtle-punctuation">_.</span>throttle</code></a></li>
<li><a href="#wrap"><code><span class="subtle-punctuation">_.</span>wrap</code></a></li>
</ul>
</div>
<div>
<h2><code>Objects</code></h2>
<ul>
<li><a href="#assign"><code><span class="subtle-punctuation">_.</span>assign</code></a></li>
<li><a href="#clone"><code><span class="subtle-punctuation">_.</span>clone</code></a></li>
<li><a href="#cloneDeep"><code><span class="subtle-punctuation">_.</span>cloneDeep</code></a></li>
<li><a href="#create"><code><span class="subtle-punctuation">_.</span>create</code></a></li>
<li><a href="#defaults"><code><span class="subtle-punctuation">_.</span>defaults</code></a></li>
<li><a href="#assign" class="alias"><code><span class="subtle-punctuation">_.</span>extend</code> -> <code>assign</code></a></li>
<li><a href="#findKey"><code><span class="subtle-punctuation">_.</span>findKey</code></a></li>
<li><a href="#findLastKey"><code><span class="subtle-punctuation">_.</span>findLastKey</code></a></li>
<li><a href="#forIn"><code><span class="subtle-punctuation">_.</span>forIn</code></a></li>
<li><a href="#forInRight"><code><span class="subtle-punctuation">_.</span>forInRight</code></a></li>
<li><a href="#forOwn"><code><span class="subtle-punctuation">_.</span>forOwn</code></a></li>
<li><a href="#forOwnRight"><code><span class="subtle-punctuation">_.</span>forOwnRight</code></a></li>
<li><a href="#functions"><code><span class="subtle-punctuation">_.</span>functions</code></a></li>
<li><a href="#has"><code><span class="subtle-punctuation">_.</span>has</code></a></li>
<li><a href="#invert"><code><span class="subtle-punctuation">_.</span>invert</code></a></li>
<li><a href="#isArguments"><code><span class="subtle-punctuation">_.</span>isArguments</code></a></li>
<li><a href="#isArray"><code><span class="subtle-punctuation">_.</span>isArray</code></a></li>
<li><a href="#isBoolean"><code><span class="subtle-punctuation">_.</span>isBoolean</code></a></li>
<li><a href="#isDate"><code><span class="subtle-punctuation">_.</span>isDate</code></a></li>
<li><a href="#isElement"><code><span class="subtle-punctuation">_.</span>isElement</code></a></li>
<li><a href="#isEmpty"><code><span class="subtle-punctuation">_.</span>isEmpty</code></a></li>
<li><a href="#isEqual"><code><span class="subtle-punctuation">_.</span>isEqual</code></a></li>
<li><a href="#isFinite"><code><span class="subtle-punctuation">_.</span>isFinite</code></a></li>
<li><a href="#isFunction"><code><span class="subtle-punctuation">_.</span>isFunction</code></a></li>
<li><a href="#isNaN"><code><span class="subtle-punctuation">_.</span>isNaN</code></a></li>
<li><a href="#isNull"><code><span class="subtle-punctuation">_.</span>isNull</code></a></li>
<li><a href="#isNumber"><code><span class="subtle-punctuation">_.</span>isNumber</code></a></li>
<li><a href="#isObject"><code><span class="subtle-punctuation">_.</span>isObject</code></a></li>
<li><a href="#isPlainObject"><code><span class="subtle-punctuation">_.</span>isPlainObject</code></a></li>
<li><a href="#isRegExp"><code><span class="subtle-punctuation">_.</span>isRegExp</code></a></li>
<li><a href="#isString"><code><span class="subtle-punctuation">_.</span>isString</code></a></li>
<li><a href="#isUndefined"><code><span class="subtle-punctuation">_.</span>isUndefined</code></a></li>
<li><a href="#keys"><code><span class="subtle-punctuation">_.</span>keys</code></a></li>
<li><a href="#mapValues"><code><span class="subtle-punctuation">_.</span>mapValues</code></a></li>
<li><a href="#merge"><code><span class="subtle-punctuation">_.</span>merge</code></a></li>
<li><a href="#functions" class="alias"><code><span class="subtle-punctuation">_.</span>methods</code> -> <code>functions</code></a></li>
<li><a href="#omit"><code><span class="subtle-punctuation">_.</span>omit</code></a></li>
<li><a href="#pairs"><code><span class="subtle-punctuation">_.</span>pairs</code></a></li>
<li><a href="#pick"><code><span class="subtle-punctuation">_.</span>pick</code></a></li>
<li><a href="#transform"><code><span class="subtle-punctuation">_.</span>transform</code></a></li>
<li><a href="#values"><code><span class="subtle-punctuation">_.</span>values</code></a></li>
</ul>
</div>
<div>
<h2><code>Utilities</code></h2>
<ul>
<li><a href="#constant"><code><span class="subtle-punctuation">_.</span>constant</code></a></li>
<li><a href="#createCallback"><code><span class="subtle-punctuation">_.</span>createCallback</code></a></li>
<li><a href="#escape"><code><span class="subtle-punctuation">_.</span>escape</code></a></li>
<li><a href="#identity"><code><span class="subtle-punctuation">_.</span>identity</code></a></li>
<li><a href="#mixin"><code><span class="subtle-punctuation">_.</span>mixin</code></a></li>
<li><a href="#noConflict"><code><span class="subtle-punctuation">_.</span>noConflict</code></a></li>
<li><a href="#noop"><code><span class="subtle-punctuation">_.</span>noop</code></a></li>
<li><a href="#now"><code><span class="subtle-punctuation">_.</span>now</code></a></li>
<li><a href="#parseInt"><code><span class="subtle-punctuation">_.</span>parseInt</code></a></li>
<li><a href="#property"><code><span class="subtle-punctuation">_.</span>property</code></a></li>
<li><a href="#random"><code><span class="subtle-punctuation">_.</span>random</code></a></li>
<li><a href="#result"><code><span class="subtle-punctuation">_.</span>result</code></a></li>
<li><a href="#runInContext"><code><span class="subtle-punctuation">_.</span>runInContext</code></a></li>
<li><a href="#template"><code><span class="subtle-punctuation">_.</span>template</code></a></li>
<li><a href="#times"><code><span class="subtle-punctuation">_.</span>times</code></a></li>
<li><a href="#unescape"><code><span class="subtle-punctuation">_.</span>unescape</code></a></li>
<li><a href="#uniqueId"><code><span class="subtle-punctuation">_.</span>uniqueId</code></a></li>
</ul>
</div>
<div>
<h2><code>Properties</code></h2>
<ul>
<li><a href="#VERSION"><code><span class="subtle-punctuation">_.</span>VERSION</code></a></li>
<li><a href="#support"><code><span class="subtle-punctuation">_.</span>support</code></a></li>
<li><a href="#support-argsClass"><code><span class="subtle-punctuation">_.</span>support.argsClass</code></a></li>
<li><a href="#support-argsObject"><code><span class="subtle-punctuation">_.</span>support.argsObject</code></a></li>
<li><a href="#support-enumErrorProps"><code><span class="subtle-punctuation">_.</span>support.enumErrorProps</code></a></li>
<li><a href="#support-enumPrototypes"><code><span class="subtle-punctuation">_.</span>support.enumPrototypes</code></a></li>
<li><a href="#support-funcDecomp"><code><span class="subtle-punctuation">_.</span>support.funcDecomp</code></a></li>
<li><a href="#support-funcNames"><code><span class="subtle-punctuation">_.</span>support.funcNames</code></a></li>
<li><a href="#support-nonEnumArgs"><code><span class="subtle-punctuation">_.</span>support.nonEnumArgs</code></a></li>
<li><a href="#support-nonEnumShadows"><code><span class="subtle-punctuation">_.</span>support.nonEnumShadows</code></a></li>
<li><a href="#support-ownLast"><code><span class="subtle-punctuation">_.</span>support.ownLast</code></a></li>
<li><a href="#support-spliceObjects"><code><span class="subtle-punctuation">_.</span>support.spliceObjects</code></a></li>
<li><a href="#support-unindexedChars"><code><span class="subtle-punctuation">_.</span>support.unindexedChars</code></a></li>
<li><a href="#templateSettings"><code><span class="subtle-punctuation">_.</span>templateSettings</code></a></li>
<li><a href="#templateSettings-escape"><code><span class="subtle-punctuation">_.</span>templateSettings.escape</code></a></li>
<li><a href="#templateSettings-evaluate"><code><span class="subtle-punctuation">_.</span>templateSettings.evaluate</code></a></li>
<li><a href="#templateSettings-imports"><code><span class="subtle-punctuation">_.</span>templateSettings.imports</code></a></li>
<li><a href="#templateSettings-imports-_"><code><span class="subtle-punctuation">_.</span>templateSettings.imports._</code></a></li>
<li><a href="#templateSettings-interpolate"><code><span class="subtle-punctuation">_.</span>templateSettings.interpolate</code></a></li>
<li><a href="#templateSettings-variable"><code><span class="subtle-punctuation">_.</span>templateSettings.variable</code></a></li>
</ul>
</div>
</div>
<div class="doc-container">
<div>
<h2><code>“Arrays” Methods</code></h2>
<div>
<h3 id="compact"><a href="#compact" class="fa fa-link"></a><code>_.compact(array)</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L4480">source</a> <a href="https://www.npmjs.com/package/lodash.compact">npm package</a></p>
<p>Creates an array with all falsey values removed. The values <code>false</code>, <code>null</code>,
<code>0</code>, <code>""</code>, <code>undefined</code>, and <code>NaN</code> are all falsey.</p>
<h4>Arguments</h4>
<ol>
<li><code>array</code> <em>(Array)</em>: The array to compact.</li>
</ol>
<h4>Returns</h4>
<p><em>(Array)</em>: Returns a new array of filtered values.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div>_<span class="delimiter">.</span><span class="support">compact</span>([<span class="numeric">0</span><span class="delimiter">,</span> <span class="numeric">1</span><span class="delimiter">,</span> false<span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="string">''</span><span class="delimiter">,</span> <span class="numeric">3</span>]);</div><div><span class="comment">// => [1, 2, 3]</span></div></pre></div>
</div>
<div>
<h3 id="difference"><a href="#difference" class="fa fa-link"></a><code>_.difference(array, [values])</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L4509">source</a> <a href="https://www.npmjs.com/package/lodash.difference">npm package</a></p>
<p>Creates an array excluding all values of the provided arrays using strict
equality for comparisons, i.e. <code>===</code>.</p>
<h4>Arguments</h4>
<ol>
<li><code>array</code> <em>(Array)</em>: The array to process.</li>
<li><code>[values]</code> <em>(...Array)</em>: The arrays of values to exclude.</li>
</ol>
<h4>Returns</h4>
<p><em>(Array)</em>: Returns a new array of filtered values.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div>_<span class="delimiter method">.</span><span class="name">difference</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span><span class="delimiter">,</span> <span class="numeric">4</span><span class="delimiter">,</span> <span class="numeric">5</span>]<span class="delimiter">,</span> [<span class="numeric">5</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">10</span>]);</div><div><span class="comment">// => [1, 3, 4]</span></div></pre></div>
</div>
<div>
<h3 id="findIndex"><a href="#findIndex" class="fa fa-link"></a><code>_.findIndex(array, [callback=identity], [thisArg])</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L4554">source</a> <a href="https://www.npmjs.com/package/lodash.findindex">npm package</a></p>
<p>This method is like <a href="#find"><code>_.find</code></a> except that it returns the index of the first
element that passes the callback check, instead of the element itself.
<br>
<br>
If a property name is provided for <code>callback</code> the created "<em>.pluck" style
callback will return the property value of the given element.
<br>
<br>
If an object is provided for <code>callback</code> the created "</em>.where" style callback
will return <code>true</code> for elements that have the properties of the given object,
else <code>false</code>.</p>
<h4>Arguments</h4>
<ol>
<li><code>array</code> <em>(Array)</em>: The array to search.</li>
<li><code>[callback=identity]</code> <em>(Function|Object|string)</em>: The function called per iteration. If a property name or object is provided it will be used to create a "<em>.pluck" or "</em>.where" style callback, respectively.</li>
<li><code>[thisArg]</code> <em>(*)</em>: The <code>this</code> binding of <code>callback</code>.</li>
</ol>
<h4>Returns</h4>
<p><em>(number)</em>: Returns the index of the found element, else <code>-1</code>.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div><span class="type">var</span> characters = [</div><div>  { <span class="string">'name'</span>: <span class="string">'barney'</span><span class="delimiter">,</span>  <span class="string">'age'</span>: <span class="numeric">36</span><span class="delimiter">,</span> <span class="string">'blocked'</span>: false }<span class="delimiter">,</span></div><div>  { <span class="string">'name'</span>: <span class="string">'fred'</span><span class="delimiter">,</span>    <span class="string">'age'</span>: <span class="numeric">40</span><span class="delimiter">,</span> <span class="string">'blocked'</span>: true }<span class="delimiter">,</span></div><div>  { <span class="string">'name'</span>: <span class="string">'pebbles'</span><span class="delimiter">,</span> <span class="string">'age'</span>: <span class="numeric">1</span><span class="delimiter">,</span>  <span class="string">'blocked'</span>: false }</div><div>];</div><div> </div><div>_<span class="delimiter method">.</span><span class="name">findIndex</span>(characters<span class="delimiter">,</span> <span class="type">function</span>(chr) {</div><div>  return chr<span class="delimiter">.</span>age < <span class="numeric">20</span>;</div><div>});</div><div><span class="comment">// => 2</span></div><div> </div><div><span class="comment">// using "_.where" callback shorthand</span></div><div>_<span class="delimiter method">.</span><span class="name">findIndex</span>(characters<span class="delimiter">,</span> { <span class="string">'age'</span>: <span class="numeric">36</span> });</div><div><span class="comment">// => 0</span></div><div> </div><div><span class="comment">// using "_.pluck" callback shorthand</span></div><div>_<span class="delimiter method">.</span><span class="name">findIndex</span>(characters<span class="delimiter">,</span> <span class="string">'blocked'</span>);</div><div><span class="comment">// => 1</span></div></pre></div>
</div>
<div>
<h3 id="findLastIndex"><a href="#findLastIndex" class="fa fa-link"></a><code>_.findLastIndex(array, [callback=identity], [thisArg])</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L4608">source</a> <a href="https://www.npmjs.com/package/lodash.findlastindex">npm package</a></p>
<p>This method is like <a href="#findIndex"><code>_.findIndex</code></a> except that it iterates over elements
of a <code>collection</code> from right to left.
<br>
<br>
If a property name is provided for <code>callback</code> the created "<em>.pluck" style
callback will return the property value of the given element.
<br>
<br>
If an object is provided for <code>callback</code> the created "</em>.where" style callback
will return <code>true</code> for elements that have the properties of the given object,
else <code>false</code>.</p>
<h4>Arguments</h4>
<ol>
<li><code>array</code> <em>(Array)</em>: The array to search.</li>
<li><code>[callback=identity]</code> <em>(Function|Object|string)</em>: The function called per iteration. If a property name or object is provided it will be used to create a "<em>.pluck" or "</em>.where" style callback, respectively.</li>
<li><code>[thisArg]</code> <em>(*)</em>: The <code>this</code> binding of <code>callback</code>.</li>
</ol>
<h4>Returns</h4>
<p><em>(number)</em>: Returns the index of the found element, else <code>-1</code>.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div><span class="type">var</span> characters = [</div><div>  { <span class="string">'name'</span>: <span class="string">'barney'</span><span class="delimiter">,</span>  <span class="string">'age'</span>: <span class="numeric">36</span><span class="delimiter">,</span> <span class="string">'blocked'</span>: true }<span class="delimiter">,</span></div><div>  { <span class="string">'name'</span>: <span class="string">'fred'</span><span class="delimiter">,</span>    <span class="string">'age'</span>: <span class="numeric">40</span><span class="delimiter">,</span> <span class="string">'blocked'</span>: false }<span class="delimiter">,</span></div><div>  { <span class="string">'name'</span>: <span class="string">'pebbles'</span><span class="delimiter">,</span> <span class="string">'age'</span>: <span class="numeric">1</span><span class="delimiter">,</span>  <span class="string">'blocked'</span>: true }</div><div>];</div><div> </div><div>_<span class="delimiter method">.</span><span class="name">findLastIndex</span>(characters<span class="delimiter">,</span> <span class="type">function</span>(chr) {</div><div>  return chr<span class="delimiter">.</span>age > <span class="numeric">30</span>;</div><div>});</div><div><span class="comment">// => 1</span></div><div> </div><div><span class="comment">// using "_.where" callback shorthand</span></div><div>_<span class="delimiter method">.</span><span class="name">findLastIndex</span>(characters<span class="delimiter">,</span> { <span class="string">'age'</span>: <span class="numeric">36</span> });</div><div><span class="comment">// => 0</span></div><div> </div><div><span class="comment">// using "_.pluck" callback shorthand</span></div><div>_<span class="delimiter method">.</span><span class="name">findLastIndex</span>(characters<span class="delimiter">,</span> <span class="string">'blocked'</span>);</div><div><span class="comment">// => 2</span></div></pre></div>
</div>
<div>
<h3 id="first"><a href="#first" class="fa fa-link"></a><code>_.first(array, [callback], [thisArg])</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L4670">source</a> <a href="https://www.npmjs.com/package/lodash.first">npm package</a></p>
<p>Gets the first element or first <code>n</code> elements of an array. If a callback
is provided elements at the beginning of the array are returned as long
as the callback returns truey. The callback is bound to <code>thisArg</code> and
invoked with three arguments; <em>(value, index, array)</em>.
<br>
<br>
If a property name is provided for <code>callback</code> the created "<em>.pluck" style
callback will return the property value of the given element.
<br>
<br>
If an object is provided for <code>callback</code> the created "</em>.where" style callback
will return <code>true</code> for elements that have the properties of the given object,
else <code>false</code>.</p>
<h4>Aliases</h4>
<p><em>_.head, _.take</em></p>
<h4>Arguments</h4>
<ol>
<li><code>array</code> <em>(Array)</em>: The array to query.</li>
<li><code>[callback]</code> <em>(Function|Object|number|string)</em>: The function called per element or the number of elements to return. If a property name or object is provided it will be used to create a "<em>.pluck" or "</em>.where" style callback, respectively.</li>
<li><code>[thisArg]</code> <em>(*)</em>: The <code>this</code> binding of <code>callback</code>.</li>
</ol>
<h4>Returns</h4>
<p><em>(*): Returns the first element(s)</em> of <code>array</code>.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div>_<span class="delimiter method">.</span><span class="name">first</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span>]);</div><div><span class="comment">// => 1</span></div><div> </div><div>_<span class="delimiter method">.</span><span class="name">first</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span>]<span class="delimiter">,</span> <span class="numeric">2</span>);</div><div><span class="comment">// => [1, 2]</span></div><div> </div><div>_<span class="delimiter method">.</span><span class="name">first</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span>]<span class="delimiter">,</span> <span class="type">function</span>(num) {</div><div>  return num < <span class="numeric">3</span>;</div><div>});</div><div><span class="comment">// => [1, 2]</span></div><div> </div><div><span class="type">var</span> characters = [</div><div>  { <span class="string">'name'</span>: <span class="string">'barney'</span><span class="delimiter">,</span>  <span class="string">'blocked'</span>: true<span class="delimiter">,</span>  <span class="string">'employer'</span>: <span class="string">'slate'</span> }<span class="delimiter">,</span></div><div>  { <span class="string">'name'</span>: <span class="string">'fred'</span><span class="delimiter">,</span>    <span class="string">'blocked'</span>: false<span class="delimiter">,</span> <span class="string">'employer'</span>: <span class="string">'slate'</span> }<span class="delimiter">,</span></div><div>  { <span class="string">'name'</span>: <span class="string">'pebbles'</span><span class="delimiter">,</span> <span class="string">'blocked'</span>: true<span class="delimiter">,</span>  <span class="string">'employer'</span>: <span class="string">'na'</span> }</div><div>];</div><div> </div><div><span class="comment">// using "_.pluck" callback shorthand</span></div><div>_<span class="delimiter method">.</span><span class="name">first</span>(characters<span class="delimiter">,</span> <span class="string">'blocked'</span>);</div><div><span class="comment">// => [{ 'name': 'barney', 'blocked': true, 'employer': 'slate' }]</span></div><div> </div><div><span class="comment">// using "_.where" callback shorthand</span></div><div>_<span class="delimiter method">.</span><span class="name">pluck</span>(_<span class="delimiter method">.</span><span class="name">first</span>(characters<span class="delimiter">,</span> { <span class="string">'employer'</span>: <span class="string">'slate'</span> })<span class="delimiter">,</span> <span class="string">'name'</span>);</div><div><span class="comment">// => ['barney', 'fred']</span></div></pre></div>
</div>
<div>
<h3 id="flatten"><a href="#flatten" class="fa fa-link"></a><code>_.flatten(array, [isShallow=false], [callback=identity], [thisArg])</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L4730">source</a> <a href="https://www.npmjs.com/package/lodash.flatten">npm package</a></p>
<p>Flattens a nested array <em>(the nesting can be to any depth)</em>. If <code>isShallow</code>
is truey, the array will only be flattened a single level. If a callback
is provided each element of the array is passed through the callback before
flattening. The callback is bound to <code>thisArg</code> and invoked with three
arguments; <em>(value, index, array)</em>.
<br>
<br>
If a property name is provided for <code>callback</code> the created "<em>.pluck" style
callback will return the property value of the given element.
<br>
<br>
If an object is provided for <code>callback</code> the created "</em>.where" style callback
will return <code>true</code> for elements that have the properties of the given object,
else <code>false</code>.</p>
<h4>Arguments</h4>
<ol>
<li><code>array</code> <em>(Array)</em>: The array to flatten.</li>
<li><code>[isShallow=false]</code> <em>(boolean)</em>: A flag to restrict flattening to a single level.</li>
<li><code>[callback=identity]</code> <em>(Function|Object|string)</em>: The function called per iteration. If a property name or object is provided it will be used to create a "<em>.pluck" or "</em>.where" style callback, respectively.</li>
<li><code>[thisArg]</code> <em>(*)</em>: The <code>this</code> binding of <code>callback</code>.</li>
</ol>
<h4>Returns</h4>
<p><em>(Array)</em>: Returns a new flattened array.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div>_<span class="delimiter method">.</span><span class="name">flatten</span>([<span class="numeric">1</span><span class="delimiter">,</span> [<span class="numeric">2</span>]<span class="delimiter">,</span> [<span class="numeric">3</span><span class="delimiter">,</span> [[<span class="numeric">4</span>]]]]);</div><div><span class="comment">// => [1, 2, 3, 4];</span></div><div> </div><div>_<span class="delimiter method">.</span><span class="name">flatten</span>([<span class="numeric">1</span><span class="delimiter">,</span> [<span class="numeric">2</span>]<span class="delimiter">,</span> [<span class="numeric">3</span><span class="delimiter">,</span> [[<span class="numeric">4</span>]]]]<span class="delimiter">,</span> true);</div><div><span class="comment">// => [1, 2, 3, [[4]]];</span></div><div> </div><div><span class="type">var</span> characters = [</div><div>  { <span class="string">'name'</span>: <span class="string">'barney'</span><span class="delimiter">,</span> <span class="string">'age'</span>: <span class="numeric">30</span><span class="delimiter">,</span> <span class="string">'pets'</span>: [<span class="string">'hoppy'</span>] }<span class="delimiter">,</span></div><div>  { <span class="string">'name'</span>: <span class="string">'fred'</span><span class="delimiter">,</span>   <span class="string">'age'</span>: <span class="numeric">40</span><span class="delimiter">,</span> <span class="string">'pets'</span>: [<span class="string">'baby puss'</span><span class="delimiter">,</span> <span class="string">'dino'</span>] }</div><div>];</div><div> </div><div><span class="comment">// using "_.pluck" callback shorthand</span></div><div>_<span class="delimiter method">.</span><span class="name">flatten</span>(characters<span class="delimiter">,</span> <span class="string">'pets'</span>);</div><div><span class="comment">// => ['hoppy', 'baby puss', 'dino']</span></div></pre></div>
</div>
<div>
<h3 id="indexOf"><a href="#indexOf" class="fa fa-link"></a><code>_.indexOf(array, value, [fromIndex=0])</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L4767">source</a> <a href="https://www.npmjs.com/package/lodash.indexof">npm package</a></p>
<p>Gets the index at which the first occurrence of <code>value</code> is found using
strict equality for comparisons, i.e. <code>===</code>. If the array is already sorted
providing <code>true</code> for <code>fromIndex</code> will run a faster binary search.</p>
<h4>Arguments</h4>
<ol>
<li><code>array</code> <em>(Array)</em>: The array to search.</li>
<li><code>value</code> <em>(*)</em>: The value to search for.</li>
<li><code>[fromIndex=0]</code> <em>(boolean|number)</em>: The index to search from or <code>true</code> to perform a binary search on a sorted array.</li>
</ol>
<h4>Returns</h4>
<p><em>(number)</em>: Returns the index of the matched value or <code>-1</code>.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div>_<span class="delimiter method">.</span><span class="support">indexOf</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span><span class="delimiter">,</span> <span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span>]<span class="delimiter">,</span> <span class="numeric">2</span>);</div><div><span class="comment">// => 1</span></div><div> </div><div>_<span class="delimiter method">.</span><span class="support">indexOf</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span><span class="delimiter">,</span> <span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span>]<span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span>);</div><div><span class="comment">// => 4</span></div><div> </div><div>_<span class="delimiter method">.</span><span class="support">indexOf</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span><span class="delimiter">,</span> <span class="numeric">3</span>]<span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> true);</div><div><span class="comment">// => 2</span></div></pre></div>
</div>
<div>
<h3 id="initial"><a href="#initial" class="fa fa-link"></a><code>_.initial(array, [callback=1], [thisArg])</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L4828">source</a> <a href="https://www.npmjs.com/package/lodash.initial">npm package</a></p>
<p>Gets all but the last element or last <code>n</code> elements of an array. If a
callback is provided elements at the end of the array are excluded from
the result as long as the callback returns truey. The callback is bound
to <code>thisArg</code> and invoked with three arguments; <em>(value, index, array)</em>.
<br>
<br>
If a property name is provided for <code>callback</code> the created "<em>.pluck" style
callback will return the property value of the given element.
<br>
<br>
If an object is provided for <code>callback</code> the created "</em>.where" style callback
will return <code>true</code> for elements that have the properties of the given object,
else <code>false</code>.</p>
<h4>Arguments</h4>
<ol>
<li><code>array</code> <em>(Array)</em>: The array to query.</li>
<li><code>[callback=1]</code> <em>(Function|Object|number|string)</em>: The function called per element or the number of elements to exclude. If a property name or object is provided it will be used to create a "<em>.pluck" or "</em>.where" style callback, respectively.</li>
<li><code>[thisArg]</code> <em>(*)</em>: The <code>this</code> binding of <code>callback</code>.</li>
</ol>
<h4>Returns</h4>
<p><em>(Array)</em>: Returns a slice of <code>array</code>.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div>_<span class="delimiter method">.</span><span class="name">initial</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span>]);</div><div><span class="comment">// => [1, 2]</span></div><div> </div><div>_<span class="delimiter method">.</span><span class="name">initial</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span>]<span class="delimiter">,</span> <span class="numeric">2</span>);</div><div><span class="comment">// => [1]</span></div><div> </div><div>_<span class="delimiter method">.</span><span class="name">initial</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span>]<span class="delimiter">,</span> <span class="type">function</span>(num) {</div><div>  return num > <span class="numeric">1</span>;</div><div>});</div><div><span class="comment">// => [1]</span></div><div> </div><div><span class="type">var</span> characters = [</div><div>  { <span class="string">'name'</span>: <span class="string">'barney'</span><span class="delimiter">,</span>  <span class="string">'blocked'</span>: false<span class="delimiter">,</span> <span class="string">'employer'</span>: <span class="string">'slate'</span> }<span class="delimiter">,</span></div><div>  { <span class="string">'name'</span>: <span class="string">'fred'</span><span class="delimiter">,</span>    <span class="string">'blocked'</span>: true<span class="delimiter">,</span>  <span class="string">'employer'</span>: <span class="string">'slate'</span> }<span class="delimiter">,</span></div><div>  { <span class="string">'name'</span>: <span class="string">'pebbles'</span><span class="delimiter">,</span> <span class="string">'blocked'</span>: true<span class="delimiter">,</span>  <span class="string">'employer'</span>: <span class="string">'na'</span> }</div><div>];</div><div> </div><div><span class="comment">// using "_.pluck" callback shorthand</span></div><div>_<span class="delimiter method">.</span><span class="name">initial</span>(characters<span class="delimiter">,</span> <span class="string">'blocked'</span>);</div><div><span class="comment">// => [{ 'name': 'barney',  'blocked': false, 'employer': 'slate' }]</span></div><div> </div><div><span class="comment">// using "_.where" callback shorthand</span></div><div>_<span class="delimiter method">.</span><span class="name">pluck</span>(_<span class="delimiter method">.</span><span class="name">initial</span>(characters<span class="delimiter">,</span> { <span class="string">'employer'</span>: <span class="string">'na'</span> })<span class="delimiter">,</span> <span class="string">'name'</span>);</div><div><span class="comment">// => ['barney', 'fred']</span></div></pre></div>
</div>
<div>
<h3 id="intersection"><a href="#intersection" class="fa fa-link"></a><code>_.intersection([array])</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L4858">source</a> <a href="https://www.npmjs.com/package/lodash.intersection">npm package</a></p>
<p>Creates an array of unique values present in all provided arrays using
strict equality for comparisons, i.e. <code>===</code>.</p>
<h4>Arguments</h4>
<ol>
<li><code>[array]</code> <em>(...Array)</em>: The arrays to inspect.</li>
</ol>
<h4>Returns</h4>
<p><em>(Array)</em>: Returns an array of shared values.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div>_<span class="delimiter method">.</span><span class="name">intersection</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span>]<span class="delimiter">,</span> [<span class="numeric">5</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">4</span>]<span class="delimiter">,</span> [<span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">1</span>]);</div><div><span class="comment">// => [1, 2]</span></div></pre></div>
</div>
<div>
<h3 id="last"><a href="#last" class="fa fa-link"></a><code>_.last(array, [callback], [thisArg])</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L4958">source</a> <a href="https://www.npmjs.com/package/lodash.last">npm package</a></p>
<p>Gets the last element or last <code>n</code> elements of an array. If a callback is
provided elements at the end of the array are returned as long as the
callback returns truey. The callback is bound to <code>thisArg</code> and invoked
with three arguments; <em>(value, index, array)</em>.
<br>
<br>
If a property name is provided for <code>callback</code> the created "<em>.pluck" style
callback will return the property value of the given element.
<br>
<br>
If an object is provided for <code>callback</code> the created "</em>.where" style callback
will return <code>true</code> for elements that have the properties of the given object,
else <code>false</code>.</p>
<h4>Arguments</h4>
<ol>
<li><code>array</code> <em>(Array)</em>: The array to query.</li>
<li><code>[callback]</code> <em>(Function|Object|number|string)</em>: The function called per element or the number of elements to return. If a property name or object is provided it will be used to create a "<em>.pluck" or "</em>.where" style callback, respectively.</li>
<li><code>[thisArg]</code> <em>(*)</em>: The <code>this</code> binding of <code>callback</code>.</li>
</ol>
<h4>Returns</h4>
<p><em>(*): Returns the last element(s)</em> of <code>array</code>.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div>_<span class="delimiter method">.</span><span class="name">last</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span>]);</div><div><span class="comment">// => 3</span></div><div> </div><div>_<span class="delimiter method">.</span><span class="name">last</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span>]<span class="delimiter">,</span> <span class="numeric">2</span>);</div><div><span class="comment">// => [2, 3]</span></div><div> </div><div>_<span class="delimiter method">.</span><span class="name">last</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span>]<span class="delimiter">,</span> <span class="type">function</span>(num) {</div><div>  return num > <span class="numeric">1</span>;</div><div>});</div><div><span class="comment">// => [2, 3]</span></div><div> </div><div><span class="type">var</span> characters = [</div><div>  { <span class="string">'name'</span>: <span class="string">'barney'</span><span class="delimiter">,</span>  <span class="string">'blocked'</span>: false<span class="delimiter">,</span> <span class="string">'employer'</span>: <span class="string">'slate'</span> }<span class="delimiter">,</span></div><div>  { <span class="string">'name'</span>: <span class="string">'fred'</span><span class="delimiter">,</span>    <span class="string">'blocked'</span>: true<span class="delimiter">,</span>  <span class="string">'employer'</span>: <span class="string">'slate'</span> }<span class="delimiter">,</span></div><div>  { <span class="string">'name'</span>: <span class="string">'pebbles'</span><span class="delimiter">,</span> <span class="string">'blocked'</span>: true<span class="delimiter">,</span>  <span class="string">'employer'</span>: <span class="string">'na'</span> }</div><div>];</div><div> </div><div><span class="comment">// using "_.pluck" callback shorthand</span></div><div>_<span class="delimiter method">.</span><span class="name">pluck</span>(_<span class="delimiter method">.</span><span class="name">last</span>(characters<span class="delimiter">,</span> <span class="string">'blocked'</span>)<span class="delimiter">,</span> <span class="string">'name'</span>);</div><div><span class="comment">// => ['fred', 'pebbles']</span></div><div> </div><div><span class="comment">// using "_.where" callback shorthand</span></div><div>_<span class="delimiter method">.</span><span class="name">last</span>(characters<span class="delimiter">,</span> { <span class="string">'employer'</span>: <span class="string">'na'</span> });</div><div><span class="comment">// => [{ 'name': 'pebbles', 'blocked': true, 'employer': 'na' }]</span></div></pre></div>
</div>
<div>
<h3 id="lastIndexOf"><a href="#lastIndexOf" class="fa fa-link"></a><code>_.lastIndexOf(array, value, [fromIndex=array.length-1])</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L5004">source</a> <a href="https://www.npmjs.com/package/lodash.lastindexof">npm package</a></p>
<p>Gets the index at which the last occurrence of <code>value</code> is found using strict
equality for comparisons, i.e. <code>===</code>. If <code>fromIndex</code> is negative, it is used
as the offset from the end of the collection.
<br>
<br>
If a property name is provided for <code>callback</code> the created "<em>.pluck" style
callback will return the property value of the given element.
<br>
<br>
If an object is provided for <code>callback</code> the created "</em>.where" style callback
will return <code>true</code> for elements that have the properties of the given object,
else <code>false</code>.</p>
<h4>Arguments</h4>
<ol>
<li><code>array</code> <em>(Array)</em>: The array to search.</li>
<li><code>value</code> <em>(*)</em>: The value to search for.</li>
<li><code>[fromIndex=array.length-1]</code> <em>(number)</em>: The index to search from.</li>
</ol>
<h4>Returns</h4>
<p><em>(number)</em>: Returns the index of the matched value or <code>-1</code>.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div>_<span class="delimiter method">.</span><span class="support">lastIndexOf</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span><span class="delimiter">,</span> <span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span>]<span class="delimiter">,</span> <span class="numeric">2</span>);</div><div><span class="comment">// => 4</span></div><div> </div><div>_<span class="delimiter method">.</span><span class="support">lastIndexOf</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span><span class="delimiter">,</span> <span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span>]<span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span>);</div><div><span class="comment">// => 1</span></div></pre></div>
</div>
<div>
<h3 id="pull"><a href="#pull" class="fa fa-link"></a><code>_.pull(array, [value])</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L5034">source</a> <a href="https://www.npmjs.com/package/lodash.pull">npm package</a></p>
<p>Removes all provided values from the given array using strict equality for
comparisons, i.e. <code>===</code>.</p>
<h4>Arguments</h4>
<ol>
<li><code>array</code> <em>(Array)</em>: The array to modify.</li>
<li><code>[value]</code> <em>(...*)</em>: The values to remove.</li>
</ol>
<h4>Returns</h4>
<p><em>(Array)</em>: Returns <code>array</code>.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div><span class="type">var</span> array = [<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span><span class="delimiter">,</span> <span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span>];</div><div>_<span class="delimiter method">.</span><span class="name">pull</span>(array<span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span>);</div><div><span class="name type console">console</span><span class="delimiter method">.</span><span class="support console">log</span>(array);</div><div><span class="comment">// => [1, 1]</span></div></pre></div>
</div>
<div>
<h3 id="range"><a href="#range" class="fa fa-link"></a><code>_.range([start=0], end, [step=1])</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L5085">source</a> <a href="https://www.npmjs.com/package/lodash.range">npm package</a></p>
<p>Creates an array of numbers <em>(positive and/or negative)</em> progressing from
<code>start</code> up to but not including <code>end</code>. If <code>start</code> is less than <code>stop</code> a
zero-length range is created unless a negative <code>step</code> is specified.</p>
<h4>Arguments</h4>
<ol>
<li><code>[start=0]</code> <em>(number)</em>: The start of the range.</li>
<li><code>end</code> <em>(number)</em>: The end of the range.</li>
<li><code>[step=1]</code> <em>(number)</em>: The value to increment or decrement by.</li>
</ol>
<h4>Returns</h4>
<p><em>(Array)</em>: Returns a new range array.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div>_<span class="delimiter method">.</span><span class="name">range</span>(<span class="numeric">4</span>);</div><div><span class="comment">// => [0, 1, 2, 3]</span></div><div> </div><div>_<span class="delimiter method">.</span><span class="name">range</span>(<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">5</span>);</div><div><span class="comment">// => [1, 2, 3, 4]</span></div><div> </div><div>_<span class="delimiter method">.</span><span class="name">range</span>(<span class="numeric">0</span><span class="delimiter">,</span> <span class="numeric">20</span><span class="delimiter">,</span> <span class="numeric">5</span>);</div><div><span class="comment">// => [0, 5, 10, 15]</span></div><div> </div><div>_<span class="delimiter method">.</span><span class="name">range</span>(<span class="numeric">0</span><span class="delimiter">,</span> -<span class="numeric">4</span><span class="delimiter">,</span> -<span class="numeric">1</span>);</div><div><span class="comment">// => [0, -1, -2, -3]</span></div><div> </div><div>_<span class="delimiter method">.</span><span class="name">range</span>(<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">4</span><span class="delimiter">,</span> <span class="numeric">0</span>);</div><div><span class="comment">// => [1, 1, 1]</span></div><div> </div><div>_<span class="delimiter method">.</span><span class="name">range</span>(<span class="numeric">0</span>);</div><div><span class="comment">// => []</span></div></pre></div>
</div>
<div>
<h3 id="remove"><a href="#remove" class="fa fa-link"></a><code>_.remove(array, [callback=identity], [thisArg])</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L5138">source</a> <a href="https://www.npmjs.com/package/lodash.remove">npm package</a></p>
<p>Removes all elements from an array that the callback returns truey for
and returns an array of removed elements. The callback is bound to <code>thisArg</code>
and invoked with three arguments; <em>(value, index, array)</em>.
<br>
<br>
If a property name is provided for <code>callback</code> the created "<em>.pluck" style
callback will return the property value of the given element.
<br>
<br>
If an object is provided for <code>callback</code> the created "</em>.where" style callback
will return <code>true</code> for elements that have the properties of the given object,
else <code>false</code>.</p>
<h4>Arguments</h4>
<ol>
<li><code>array</code> <em>(Array)</em>: The array to modify.</li>
<li><code>[callback=identity]</code> <em>(Function|Object|string)</em>: The function called per iteration. If a property name or object is provided it will be used to create a "<em>.pluck" or "</em>.where" style callback, respectively.</li>
<li><code>[thisArg]</code> <em>(*)</em>: The <code>this</code> binding of <code>callback</code>.</li>
</ol>
<h4>Returns</h4>
<p><em>(Array)</em>: Returns a new array of removed elements.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div><span class="type">var</span> array = [<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span><span class="delimiter">,</span> <span class="numeric">4</span><span class="delimiter">,</span> <span class="numeric">5</span><span class="delimiter">,</span> <span class="numeric">6</span>];</div><div><span class="type">var</span> evens = _<span class="delimiter method">.</span><span class="name">remove</span>(array<span class="delimiter">,</span> <span class="type">function</span>(num) { return num % <span class="numeric">2</span> == <span class="numeric">0</span>; });</div><div> </div><div><span class="name type console">console</span><span class="delimiter method">.</span><span class="support console">log</span>(array);</div><div><span class="comment">// => [1, 3, 5]</span></div><div> </div><div><span class="name type console">console</span><span class="delimiter method">.</span><span class="support console">log</span>(evens);</div><div><span class="comment">// => [2, 4, 6]</span></div></pre></div>
</div>
<div>
<h3 id="rest"><a href="#rest" class="fa fa-link"></a><code>_.rest(array, [callback=1], [thisArg])</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L5207">source</a> <a href="https://www.npmjs.com/package/lodash.rest">npm package</a></p>
<p>The opposite of <a href="#initial"><code>_.initial</code></a> this method gets all but the first element or
first <code>n</code> elements of an array. If a callback function is provided elements
at the beginning of the array are excluded from the result as long as the
callback returns truey. The callback is bound to <code>thisArg</code> and invoked
with three arguments; <em>(value, index, array)</em>.
<br>
<br>
If a property name is provided for <code>callback</code> the created "<em>.pluck" style
callback will return the property value of the given element.
<br>
<br>
If an object is provided for <code>callback</code> the created "</em>.where" style callback
will return <code>true</code> for elements that have the properties of the given object,
else <code>false</code>.</p>
<h4>Aliases</h4>
<p><em>_.drop, _.tail</em></p>
<h4>Arguments</h4>
<ol>
<li><code>array</code> <em>(Array)</em>: The array to query.</li>
<li><code>[callback=1]</code> <em>(Function|Object|number|string)</em>: The function called per element or the number of elements to exclude. If a property name or object is provided it will be used to create a "<em>.pluck" or "</em>.where" style callback, respectively.</li>
<li><code>[thisArg]</code> <em>(*)</em>: The <code>this</code> binding of <code>callback</code>.</li>
</ol>
<h4>Returns</h4>
<p><em>(Array)</em>: Returns a slice of <code>array</code>.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div>_<span class="delimiter method">.</span><span class="name">rest</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span>]);</div><div><span class="comment">// => [2, 3]</span></div><div> </div><div>_<span class="delimiter method">.</span><span class="name">rest</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span>]<span class="delimiter">,</span> <span class="numeric">2</span>);</div><div><span class="comment">// => [3]</span></div><div> </div><div>_<span class="delimiter method">.</span><span class="name">rest</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span>]<span class="delimiter">,</span> <span class="type">function</span>(num) {</div><div>  return num < <span class="numeric">3</span>;</div><div>});</div><div><span class="comment">// => [3]</span></div><div> </div><div><span class="type">var</span> characters = [</div><div>  { <span class="string">'name'</span>: <span class="string">'barney'</span><span class="delimiter">,</span>  <span class="string">'blocked'</span>: true<span class="delimiter">,</span>  <span class="string">'employer'</span>: <span class="string">'slate'</span> }<span class="delimiter">,</span></div><div>  { <span class="string">'name'</span>: <span class="string">'fred'</span><span class="delimiter">,</span>    <span class="string">'blocked'</span>: false<span class="delimiter">,</span>  <span class="string">'employer'</span>: <span class="string">'slate'</span> }<span class="delimiter">,</span></div><div>  { <span class="string">'name'</span>: <span class="string">'pebbles'</span><span class="delimiter">,</span> <span class="string">'blocked'</span>: true<span class="delimiter">,</span> <span class="string">'employer'</span>: <span class="string">'na'</span> }</div><div>];</div><div> </div><div><span class="comment">// using "_.pluck" callback shorthand</span></div><div>_<span class="delimiter method">.</span><span class="name">pluck</span>(_<span class="delimiter method">.</span><span class="name">rest</span>(characters<span class="delimiter">,</span> <span class="string">'blocked'</span>)<span class="delimiter">,</span> <span class="string">'name'</span>);</div><div><span class="comment">// => ['fred', 'pebbles']</span></div><div> </div><div><span class="comment">// using "_.where" callback shorthand</span></div><div>_<span class="delimiter method">.</span><span class="name">rest</span>(characters<span class="delimiter">,</span> { <span class="string">'employer'</span>: <span class="string">'slate'</span> });</div><div><span class="comment">// => [{ 'name': 'pebbles', 'blocked': true, 'employer': 'na' }]</span></div></pre></div>
</div>
<div>
<h3 id="sortedIndex"><a href="#sortedIndex" class="fa fa-link"></a><code>_.sortedIndex(array, value, [callback=identity], [thisArg])</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L5271">source</a> <a href="https://www.npmjs.com/package/lodash.sortedindex">npm package</a></p>
<p>Uses a binary search to determine the smallest index at which a value
should be inserted into a given sorted array in order to maintain the sort
order of the array. If a callback is provided it will be executed for
<code>value</code> and each element of <code>array</code> to compute their sort ranking. The
callback is bound to <code>thisArg</code> and invoked with one argument; <em>(value)</em>.
<br>
<br>
If a property name is provided for <code>callback</code> the created "<em>.pluck" style
callback will return the property value of the given element.
<br>
<br>
If an object is provided for <code>callback</code> the created "</em>.where" style callback
will return <code>true</code> for elements that have the properties of the given object,
else <code>false</code>.</p>
<h4>Arguments</h4>
<ol>
<li><code>array</code> <em>(Array)</em>: The array to inspect.</li>
<li><code>value</code> <em>(*)</em>: The value to evaluate.</li>
<li><code>[callback=identity]</code> <em>(Function|Object|string)</em>: The function called per iteration. If a property name or object is provided it will be used to create a "<em>.pluck" or "</em>.where" style callback, respectively.</li>
<li><code>[thisArg]</code> <em>(*)</em>: The <code>this</code> binding of <code>callback</code>.</li>
</ol>
<h4>Returns</h4>
<p><em>(number)</em>: Returns the index at which <code>value</code> should be inserted into <code>array</code>.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div>_<span class="delimiter method">.</span><span class="name">sortedIndex</span>([<span class="numeric">20</span><span class="delimiter">,</span> <span class="numeric">30</span><span class="delimiter">,</span> <span class="numeric">50</span>]<span class="delimiter">,</span> <span class="numeric">40</span>);</div><div><span class="comment">// => 2</span></div><div> </div><div><span class="comment">// using "_.pluck" callback shorthand</span></div><div>_<span class="delimiter method">.</span><span class="name">sortedIndex</span>([{ <span class="string">'x'</span>: <span class="numeric">20</span> }<span class="delimiter">,</span> { <span class="string">'x'</span>: <span class="numeric">30</span> }<span class="delimiter">,</span> { <span class="string">'x'</span>: <span class="numeric">50</span> }]<span class="delimiter">,</span> { <span class="string">'x'</span>: <span class="numeric">40</span> }<span class="delimiter">,</span> <span class="string">'x'</span>);</div><div><span class="comment">// => 2</span></div><div> </div><div><span class="type">var</span> dict = {</div><div>  <span class="string">'wordToNumber'</span>: { <span class="string">'twenty'</span>: <span class="numeric">20</span><span class="delimiter">,</span> <span class="string">'thirty'</span>: <span class="numeric">30</span><span class="delimiter">,</span> <span class="string">'fourty'</span>: <span class="numeric">40</span><span class="delimiter">,</span> <span class="string">'fifty'</span>: <span class="numeric">50</span> }</div><div>};</div><div> </div><div>_<span class="delimiter method">.</span><span class="name">sortedIndex</span>([<span class="string">'twenty'</span><span class="delimiter">,</span> <span class="string">'thirty'</span><span class="delimiter">,</span> <span class="string">'fifty'</span>]<span class="delimiter">,</span> <span class="string">'fourty'</span><span class="delimiter">,</span> <span class="type">function</span>(word) {</div><div>  return dict<span class="delimiter">.</span>wordToNumber[word];</div><div>});</div><div><span class="comment">// => 2</span></div><div> </div><div>_<span class="delimiter method">.</span><span class="name">sortedIndex</span>([<span class="string">'twenty'</span><span class="delimiter">,</span> <span class="string">'thirty'</span><span class="delimiter">,</span> <span class="string">'fifty'</span>]<span class="delimiter">,</span> <span class="string">'fourty'</span><span class="delimiter">,</span> <span class="type">function</span>(word) {</div><div>  return this<span class="delimiter">.</span>wordToNumber[word];</div><div>}<span class="delimiter">,</span> dict);</div><div><span class="comment">// => 2</span></div></pre></div>
</div>
<div>
<h3 id="union"><a href="#union" class="fa fa-link"></a><code>_.union([array])</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L5302">source</a> <a href="https://www.npmjs.com/package/lodash.union">npm package</a></p>
<p>Creates an array of unique values, in order, of the provided arrays using
strict equality for comparisons, i.e. <code>===</code>.</p>
<h4>Arguments</h4>
<ol>
<li><code>[array]</code> <em>(...Array)</em>: The arrays to inspect.</li>
</ol>
<h4>Returns</h4>
<p><em>(Array)</em>: Returns an array of combined values.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div>_<span class="delimiter method">.</span><span class="name">union</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span>]<span class="delimiter">,</span> [<span class="numeric">5</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">4</span>]<span class="delimiter">,</span> [<span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">1</span>]);</div><div><span class="comment">// => [1, 2, 3, 5, 4]</span></div></pre></div>
</div>
<div>
<h3 id="uniq"><a href="#uniq" class="fa fa-link"></a><code>_.uniq(array, [isSorted=false], [callback=identity], [thisArg])</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L5350">source</a> <a href="https://www.npmjs.com/package/lodash.uniq">npm package</a></p>
<p>Creates a duplicate-value-free version of an array using strict equality
for comparisons, i.e. <code>===</code>. If the array is sorted, providing
<code>true</code> for <code>isSorted</code> will use a faster algorithm. If a callback is provided
each element of <code>array</code> is passed through the callback before uniqueness
is computed. The callback is bound to <code>thisArg</code> and invoked with three
arguments; <em>(value, index, array)</em>.
<br>
<br>
If a property name is provided for <code>callback</code> the created "<em>.pluck" style
callback will return the property value of the given element.
<br>
<br>
If an object is provided for <code>callback</code> the created "</em>.where" style callback
will return <code>true</code> for elements that have the properties of the given object,
else <code>false</code>.</p>
<h4>Aliases</h4>
<p><em>_.unique</em></p>
<h4>Arguments</h4>
<ol>
<li><code>array</code> <em>(Array)</em>: The array to process.</li>
<li><code>[isSorted=false]</code> <em>(boolean)</em>: A flag to indicate that <code>array</code> is sorted.</li>
<li><code>[callback=identity]</code> <em>(Function|Object|string)</em>: The function called per iteration. If a property name or object is provided it will be used to create a "<em>.pluck" or "</em>.where" style callback, respectively.</li>
<li><code>[thisArg]</code> <em>(*)</em>: The <code>this</code> binding of <code>callback</code>.</li>
</ol>
<h4>Returns</h4>
<p><em>(Array)</em>: Returns a duplicate-value-free array.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div>_<span class="delimiter method">.</span><span class="name">uniq</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">3</span><span class="delimiter">,</span> <span class="numeric">1</span>]);</div><div><span class="comment">// => [1, 2, 3]</span></div><div> </div><div>_<span class="delimiter method">.</span><span class="name">uniq</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span>]<span class="delimiter">,</span> true);</div><div><span class="comment">// => [1, 2, 3]</span></div><div> </div><div>_<span class="delimiter method">.</span><span class="name">uniq</span>([<span class="string">'A'</span><span class="delimiter">,</span> <span class="string">'b'</span><span class="delimiter">,</span> <span class="string">'C'</span><span class="delimiter">,</span> <span class="string">'a'</span><span class="delimiter">,</span> <span class="string">'B'</span><span class="delimiter">,</span> <span class="string">'c'</span>]<span class="delimiter">,</span> <span class="type">function</span>(letter) { return letter<span class="delimiter method">.</span><span class="support">toLowerCase</span>(); });</div><div><span class="comment">// => ['A', 'b', 'C']</span></div><div> </div><div>_<span class="delimiter method">.</span><span class="name">uniq</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2<span class="delimiter">.</span>5</span><span class="delimiter">,</span> <span class="numeric">3</span><span class="delimiter">,</span> <span class="numeric">1<span class="delimiter">.</span>5</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3<span class="delimiter">.</span>5</span>]<span class="delimiter">,</span> <span class="type">function</span>(num) { return this<span class="delimiter method">.</span><span class="name">floor</span>(num); }<span class="delimiter">,</span> <span class="support">Math</span>);</div><div><span class="comment">// => [1, 2.5, 3]</span></div><div> </div><div><span class="comment">// using "_.pluck" callback shorthand</span></div><div>_<span class="delimiter method">.</span><span class="name">uniq</span>([{ <span class="string">'x'</span>: <span class="numeric">1</span> }<span class="delimiter">,</span> { <span class="string">'x'</span>: <span class="numeric">2</span> }<span class="delimiter">,</span> { <span class="string">'x'</span>: <span class="numeric">1</span> }]<span class="delimiter">,</span> <span class="string">'x'</span>);</div><div><span class="comment">// => [{ 'x': 1 }, { 'x': 2 }]</span></div></pre></div>
</div>
<div>
<h3 id="without"><a href="#without" class="fa fa-link"></a><code>_.without(array, [value])</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L5378">source</a> <a href="https://www.npmjs.com/package/lodash.without">npm package</a></p>
<p>Creates an array excluding all provided values using strict equality for
comparisons, i.e. <code>===</code>.</p>
<h4>Arguments</h4>
<ol>
<li><code>array</code> <em>(Array)</em>: The array to filter.</li>
<li><code>[value]</code> <em>(...*)</em>: The values to exclude.</li>
</ol>
<h4>Returns</h4>
<p><em>(Array)</em>: Returns a new array of filtered values.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div>_<span class="delimiter method">.</span><span class="name">without</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">0</span><span class="delimiter">,</span> <span class="numeric">3</span><span class="delimiter">,</span> <span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">4</span>]<span class="delimiter">,</span> <span class="numeric">0</span><span class="delimiter">,</span> <span class="numeric">1</span>);</div><div><span class="comment">// => [2, 3, 4]</span></div></pre></div>
</div>
<div>
<h3 id="xor"><a href="#xor" class="fa fa-link"></a><code>_.xor([array])</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L5399">source</a> <a href="https://www.npmjs.com/package/lodash.xor">npm package</a></p>
<p>Creates an array that is the symmetric difference of the provided arrays.
See <a href="http://en.wikipedia.org/wiki/Symmetric_difference">http://en.wikipedia.org/wiki/Symmetric_difference</a>.</p>
<h4>Arguments</h4>
<ol>
<li><code>[array]</code> <em>(...Array)</em>: The arrays to inspect.</li>
</ol>
<h4>Returns</h4>
<p><em>(Array)</em>: Returns an array of values.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div>_<span class="delimiter method">.</span><span class="name">xor</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span>]<span class="delimiter">,</span> [<span class="numeric">5</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">4</span>]);</div><div><span class="comment">// => [3, 5, 4]</span></div><div> </div><div>_<span class="delimiter method">.</span><span class="name">xor</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">5</span>]<span class="delimiter">,</span> [<span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span><span class="delimiter">,</span> <span class="numeric">5</span>]<span class="delimiter">,</span> [<span class="numeric">3</span><span class="delimiter">,</span> <span class="numeric">4</span><span class="delimiter">,</span> <span class="numeric">5</span>]);</div><div><span class="comment">// => [1, 4, 5]</span></div></pre></div>
</div>
<div>
<h3 id="zip"><a href="#zip" class="fa fa-link"></a><code>_.zip([array])</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L5430">source</a> <a href="https://www.npmjs.com/package/lodash.zip">npm package</a></p>
<p>Creates an array of grouped elements, the first of which contains the first
elements of the given arrays, the second of which contains the second
elements of the given arrays, and so on.</p>
<h4>Aliases</h4>
<p><em>_.unzip</em></p>
<h4>Arguments</h4>
<ol>
<li><code>[array]</code> <em>(...Array)</em>: Arrays to process.</li>
</ol>
<h4>Returns</h4>
<p><em>(Array)</em>: Returns a new array of grouped elements.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div>_<span class="delimiter method">.</span><span class="name">zip</span>([<span class="string">'fred'</span><span class="delimiter">,</span> <span class="string">'barney'</span>]<span class="delimiter">,</span> [<span class="numeric">30</span><span class="delimiter">,</span> <span class="numeric">40</span>]<span class="delimiter">,</span> [true<span class="delimiter">,</span> false]);</div><div><span class="comment">// => [['fred', 30, true], ['barney', 40, false]]</span></div></pre></div>
</div>
<div>
<h3 id="zipObject"><a href="#zipObject" class="fa fa-link"></a><code>_.zipObject(keys, [values=[]])</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L5460">source</a> <a href="https://www.npmjs.com/package/lodash.zipobject">npm package</a></p>
<p>Creates an object composed from arrays of <code>keys</code> and <code>values</code>. Provide
either a single two dimensional array, i.e. <code>[[key1, value1], [key2, value2]]</code>
or two arrays, one of <code>keys</code> and one of corresponding <code>values</code>.</p>
<h4>Aliases</h4>
<p><em>_.object</em></p>
<h4>Arguments</h4>
<ol>
<li><code>keys</code> <em>(Array)</em>: The array of keys.</li>
<li><code>[values=[]]</code> <em>(Array)</em>: The array of values.</li>
</ol>
<h4>Returns</h4>
<p><em>(Object)</em>: Returns an object composed of the given keys and corresponding values.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div>_<span class="delimiter method">.</span><span class="name">zipObject</span>([<span class="string">'fred'</span><span class="delimiter">,</span> <span class="string">'barney'</span>]<span class="delimiter">,</span> [<span class="numeric">30</span><span class="delimiter">,</span> <span class="numeric">40</span>]);</div><div><span class="comment">// => { 'fred': 30, 'barney': 40 }</span></div></pre></div>
</div>
</div>
<div>
<h2><code>“Chaining” Methods</code></h2>
<div>
<h3 id="lodash"><a href="#lodash" class="fa fa-link"></a><code>_(value)</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L647">source</a> <a href="https://www.npmjs.com/package/lodash._">npm package</a></p>
<p>Creates a <code>lodash</code> object which wraps the given value to enable intuitive
method chaining.
<br>
<br>
In addition to Lo-Dash methods, wrappers also have the following <code>Array</code> methods:<br>
<code>concat</code>, <code>join</code>, <code>pop</code>, <code>push</code>, <code>reverse</code>, <code>shift</code>, <code>slice</code>, <code>sort</code>, <code>splice</code>,
and <code>unshift</code>
<br>
<br>
Chaining is supported in custom builds as long as the <code>value</code> method is
implicitly or explicitly included in the build.
<br>
<br>
The chainable wrapper functions are:<br>
<code>after</code>, <code>assign</code>, <code>bind</code>, <code>bindAll</code>, <code>bindKey</code>, <code>chain</code>, <code>compact</code>,
<code>compose</code>, <code>concat</code>, <code>countBy</code>, <code>create</code>, <code>createCallback</code>, <code>curry</code>,
<code>debounce</code>, <code>defaults</code>, <code>defer</code>, <code>delay</code>, <code>difference</code>, <code>filter</code>, <code>flatten</code>,
<code>forEach</code>, <code>forEachRight</code>, <code>forIn</code>, <code>forInRight</code>, <code>forOwn</code>, <code>forOwnRight</code>,
<code>functions</code>, <code>groupBy</code>, <code>indexBy</code>, <code>initial</code>, <code>intersection</code>, <code>invert</code>,
<code>invoke</code>, <code>keys</code>, <code>map</code>, <code>max</code>, <code>memoize</code>, <code>merge</code>, <code>min</code>, <code>object</code>, <code>omit</code>,
<code>once</code>, <code>pairs</code>, <code>partial</code>, <code>partialRight</code>, <code>pick</code>, <code>pluck</code>, <code>pull</code>, <code>push</code>,
<code>range</code>, <code>reject</code>, <code>remove</code>, <code>rest</code>, <code>reverse</code>, <code>shuffle</code>, <code>slice</code>, <code>sort</code>,
<code>sortBy</code>, <code>splice</code>, <code>tap</code>, <code>throttle</code>, <code>times</code>, <code>toArray</code>, <code>transform</code>,
<code>union</code>, <code>uniq</code>, <code>unshift</code>, <code>unzip</code>, <code>values</code>, <code>where</code>, <code>without</code>, <code>wrap</code>,
and <code>zip</code>
<br>
<br>
The non-chainable wrapper functions are:<br>
<code>clone</code>, <code>cloneDeep</code>, <code>contains</code>, <code>escape</code>, <code>every</code>, <code>find</code>, <code>findIndex</code>,
<code>findKey</code>, <code>findLast</code>, <code>findLastIndex</code>, <code>findLastKey</code>, <code>has</code>, <code>identity</code>,
<code>indexOf</code>, <code>isArguments</code>, <code>isArray</code>, <code>isBoolean</code>, <code>isDate</code>, <code>isElement</code>,
<code>isEmpty</code>, <code>isEqual</code>, <code>isFinite</code>, <code>isFunction</code>, <code>isNaN</code>, <code>isNull</code>, <code>isNumber</code>,
<code>isObject</code>, <code>isPlainObject</code>, <code>isRegExp</code>, <code>isString</code>, <code>isUndefined</code>, <code>join</code>,
<code>lastIndexOf</code>, <code>mixin</code>, <code>noConflict</code>, <code>parseInt</code>, <code>pop</code>, <code>random</code>, <code>reduce</code>,
<code>reduceRight</code>, <code>result</code>, <code>shift</code>, <code>size</code>, <code>some</code>, <code>sortedIndex</code>, <code>runInContext</code>,
<code>template</code>, <code>unescape</code>, <code>uniqueId</code>, and <code>value</code>
<br>
<br>
The wrapper functions <code>first</code> and <code>last</code> return wrapped values when <code>n</code> is
provided, otherwise they return unwrapped values.
<br>
<br>
Explicit chaining can be enabled by using the <a href="#chain"><code>_.chain</code></a> method.</p>
<h4>Arguments</h4>
<ol>
<li><code>value</code> <em>(*)</em>: The value to wrap in a <code>lodash</code> instance.</li>
</ol>
<h4>Returns</h4>
<p><em>(Object)</em>: Returns a <code>lodash</code> instance.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div><span class="type">var</span> wrapped = <span class="name">_</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span>]);</div><div> </div><div><span class="comment">// returns an unwrapped value</span></div><div>wrapped<span class="delimiter method">.</span><span class="name">reduce</span>(<span class="type">function</span>(sum<span class="delimiter">,</span> num) {</div><div>  return sum + num;</div><div>});</div><div><span class="comment">// => 6</span></div><div> </div><div><span class="comment">// returns a wrapped value</span></div><div><span class="type">var</span> squares = wrapped<span class="delimiter method">.</span><span class="name">map</span>(<span class="type">function</span>(num) {</div><div>  return num * num;</div><div>});</div><div> </div><div>_<span class="delimiter method">.</span><span class="name">isArray</span>(squares);</div><div><span class="comment">// => false</span></div><div> </div><div>_<span class="delimiter method">.</span><span class="name">isArray</span>(squares<span class="delimiter">.</span><span class="support">value</span>());</div><div><span class="comment">// => true</span></div></pre></div>
</div>
<div>
<h3 id="chain"><a href="#chain" class="fa fa-link"></a><code>_.chain(value)</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L6789">source</a> <a href="https://www.npmjs.com/package/lodash.chain">npm package</a></p>
<p>Creates a <code>lodash</code> object that wraps the given value with explicit
method chaining enabled.</p>
<h4>Arguments</h4>
<ol>
<li><code>value</code> <em>(*)</em>: The value to wrap.</li>
</ol>
<h4>Returns</h4>
<p><em>(Object)</em>: Returns the wrapper object.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div><span class="type">var</span> characters = [</div><div>  { <span class="string">'name'</span>: <span class="string">'barney'</span><span class="delimiter">,</span>  <span class="string">'age'</span>: <span class="numeric">36</span> }<span class="delimiter">,</span></div><div>  { <span class="string">'name'</span>: <span class="string">'fred'</span><span class="delimiter">,</span>    <span class="string">'age'</span>: <span class="numeric">40</span> }<span class="delimiter">,</span></div><div>  { <span class="string">'name'</span>: <span class="string">'pebbles'</span><span class="delimiter">,</span> <span class="string">'age'</span>: <span class="numeric">1</span> }</div><div>];</div><div> </div><div><span class="type">var</span> youngest = _<span class="delimiter method">.</span><span class="name">chain</span>(characters)</div><div>    <span class="delimiter method">.</span><span class="name">sortBy</span>(<span class="string">'age'</span>)</div><div>    <span class="delimiter method">.</span><span class="name">map</span>(<span class="type">function</span>(chr) { return chr<span class="delimiter">.</span><span class="support">name</span> + <span class="string">' is '</span> + chr<span class="delimiter">.</span>age; })</div><div>    <span class="delimiter method">.</span><span class="name">first</span>()</div><div>    <span class="delimiter">.</span><span class="support">value</span>();</div><div><span class="comment">// => 'pebbles is 1'</span></div></pre></div>
</div>
<div>
<h3 id="tap"><a href="#tap" class="fa fa-link"></a><code>_.tap(value, interceptor)</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L6815">source</a> <a href="https://www.npmjs.com/package/lodash.tap">npm package</a></p>
<p>Invokes <code>interceptor</code> with the <code>value</code> as the first argument and then
returns <code>value</code>. The purpose of this method is to "tap into" a method
chain in order to perform operations on intermediate results within
the chain.</p>
<h4>Arguments</h4>
<ol>
<li><code>value</code> <em>(*)</em>: The value to provide to <code>interceptor</code>.</li>
<li><code>interceptor</code> <em>(Function)</em>: The function to invoke.</li>
</ol>
<h4>Returns</h4>
<p><em>(*)</em>: Returns <code>value</code>.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div><span class="name">_</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span><span class="delimiter">,</span> <span class="numeric">4</span>])</div><div> <span class="delimiter method">.</span><span class="name">tap</span>(<span class="type">function</span>(array) { array<span class="delimiter method">.</span><span class="support">pop</span>(); })</div><div> <span class="delimiter method">.</span><span class="support">reverse</span>()</div><div> <span class="delimiter">.</span><span class="support">value</span>();</div><div><span class="comment">// => [3, 2, 1]</span></div></pre></div>
</div>
<div>
<h3 id="prototype-chain"><a href="#prototype-chain" class="fa fa-link"></a><code>_.prototype.chain()</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L6845">source</a> <a href="https://www.npmjs.com/package/lodash.chain">npm package</a></p>
<p>Enables explicit method chaining on the wrapper object.</p>
<h4>Returns</h4>
<p><em>(*)</em>: Returns the wrapper object.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div><span class="type">var</span> characters = [</div><div>  { <span class="string">'name'</span>: <span class="string">'barney'</span><span class="delimiter">,</span> <span class="string">'age'</span>: <span class="numeric">36</span> }<span class="delimiter">,</span></div><div>  { <span class="string">'name'</span>: <span class="string">'fred'</span><span class="delimiter">,</span>   <span class="string">'age'</span>: <span class="numeric">40</span> }</div><div>];</div><div> </div><div><span class="comment">// without explicit chaining</span></div><div><span class="name">_</span>(characters)<span class="delimiter method">.</span><span class="name">first</span>();</div><div><span class="comment">// => { 'name': 'barney', 'age': 36 }</span></div><div> </div><div><span class="comment">// with explicit chaining</span></div><div><span class="name">_</span>(characters)<span class="delimiter method">.</span><span class="name">chain</span>()</div><div>  <span class="delimiter method">.</span><span class="name">first</span>()</div><div>  <span class="delimiter method">.</span><span class="name">pick</span>(<span class="string">'age'</span>)</div><div>  <span class="delimiter">.</span><span class="support">value</span>();</div><div><span class="comment">// => { 'age': 36 }</span></div></pre></div>
</div>
<div>
<h3 id="prototype-toString"><a href="#prototype-toString" class="fa fa-link"></a><code>_.prototype.toString()</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L6862">source</a> <a href="https://www.npmjs.com/package/lodash.tostring">npm package</a></p>
<p>Produces the <code>toString</code> result of the wrapped value.</p>
<h4>Returns</h4>
<p><em>(string)</em>: Returns the string result.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div><span class="name">_</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span>])<span class="delimiter method">.</span><span class="support">toString</span>();</div><div><span class="comment">// => '1,2,3'</span></div></pre></div>
</div>
<div>
<h3 id="prototype-valueOf"><a href="#prototype-valueOf" class="fa fa-link"></a><code>_.prototype.valueOf()</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L6879">source</a> <a href="https://www.npmjs.com/package/lodash.valueof">npm package</a></p>
<p>Extracts the wrapped value.</p>
<h4>Aliases</h4>
<p><em>_.prototype.value</em></p>
<h4>Returns</h4>
<p><em>(*)</em>: Returns the wrapped value.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div><span class="name">_</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span>])<span class="delimiter method">.</span><span class="support">valueOf</span>();</div><div><span class="comment">// => [1, 2, 3]</span></div></pre></div>
</div>
</div>
<div>
<h2><code>“Collections” Methods</code></h2>
<div>
<h3 id="at"><a href="#at" class="fa fa-link"></a><code>_.at(collection, [index])</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L3297">source</a> <a href="https://www.npmjs.com/package/lodash.at">npm package</a></p>
<p>Creates an array of elements from the specified indexes, or keys, of the
<code>collection</code>. Indexes may be specified as individual arguments or as arrays
of indexes.</p>
<h4>Arguments</h4>
<ol>
<li><code>collection</code> <em>(Array|Object|string)</em>: The collection to iterate over.</li>
<li><code>[index]</code> <em>(...(number|number[]|string|string[]))</em>: The indexes of <code>collection</code> to retrieve, specified as individual indexes or arrays of indexes.</li>
</ol>
<h4>Returns</h4>
<p><em>(Array)</em>: Returns a new array of elements corresponding to the provided indexes.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div>_<span class="delimiter method">.</span><span class="name">at</span>([<span class="string">'a'</span><span class="delimiter">,</span> <span class="string">'b'</span><span class="delimiter">,</span> <span class="string">'c'</span><span class="delimiter">,</span> <span class="string">'d'</span><span class="delimiter">,</span> <span class="string">'e'</span>]<span class="delimiter">,</span> [<span class="numeric">0</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">4</span>]);</div><div><span class="comment">// => ['a', 'c', 'e']</span></div><div> </div><div>_<span class="delimiter method">.</span><span class="name">at</span>([<span class="string">'fred'</span><span class="delimiter">,</span> <span class="string">'barney'</span><span class="delimiter">,</span> <span class="string">'pebbles'</span>]<span class="delimiter">,</span> <span class="numeric">0</span><span class="delimiter">,</span> <span class="numeric">2</span>);</div><div><span class="comment">// => ['fred', 'pebbles']</span></div></pre></div>
</div>
<div>
<h3 id="contains"><a href="#contains" class="fa fa-link"></a><code>_.contains(collection, target, [fromIndex=0])</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L3340">source</a> <a href="https://www.npmjs.com/package/lodash.contains">npm package</a></p>
<p>Checks if a given value is present in a collection using strict equality
for comparisons, i.e. <code>===</code>. If <code>fromIndex</code> is negative, it is used as the
offset from the end of the collection.</p>
<h4>Aliases</h4>
<p><em>_.include</em></p>
<h4>Arguments</h4>
<ol>
<li><code>collection</code> <em>(Array|Object|string)</em>: The collection to iterate over.</li>
<li><code>target</code> <em>(*)</em>: The value to check for.</li>
<li><code>[fromIndex=0]</code> <em>(number)</em>: The index to search from.</li>
</ol>
<h4>Returns</h4>
<p><em>(boolean)</em>: Returns <code>true</code> if the <code>target</code> element is found, else <code>false</code>.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div>_<span class="delimiter method">.</span><span class="name">contains</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span>]<span class="delimiter">,</span> <span class="numeric">1</span>);</div><div><span class="comment">// => true</span></div><div> </div><div>_<span class="delimiter method">.</span><span class="name">contains</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span>]<span class="delimiter">,</span> <span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span>);</div><div><span class="comment">// => false</span></div><div> </div><div>_<span class="delimiter method">.</span><span class="name">contains</span>({ <span class="string">'name'</span>: <span class="string">'fred'</span><span class="delimiter">,</span> <span class="string">'age'</span>: <span class="numeric">40</span> }<span class="delimiter">,</span> <span class="string">'fred'</span>);</div><div><span class="comment">// => true</span></div><div> </div><div>_<span class="delimiter method">.</span><span class="name">contains</span>(<span class="string">'pebbles'</span><span class="delimiter">,</span> <span class="string">'eb'</span>);</div><div><span class="comment">// => true</span></div></pre></div>
</div>
<div>
<h3 id="countBy"><a href="#countBy" class="fa fa-link"></a><code>_.countBy(collection, [callback=identity], [thisArg])</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L3395">source</a> <a href="https://www.npmjs.com/package/lodash.countby">npm package</a></p>
<p>Creates an object composed of keys generated from the results of running
each element of <code>collection</code> through the callback. The corresponding value
of each key is the number of times the key was returned by the callback.
The callback is bound to <code>thisArg</code> and invoked with three arguments;
<em>(value, index|key, collection)</em>.
<br>
<br>
If a property name is provided for <code>callback</code> the created "<em>.pluck" style
callback will return the property value of the given element.
<br>
<br>
If an object is provided for <code>callback</code> the created "</em>.where" style callback
will return <code>true</code> for elements that have the properties of the given object,
else <code>false</code>.</p>
<h4>Arguments</h4>
<ol>
<li><code>collection</code> <em>(Array|Object|string)</em>: The collection to iterate over.</li>
<li><code>[callback=identity]</code> <em>(Function|Object|string)</em>: The function called per iteration. If a property name or object is provided it will be used to create a "<em>.pluck" or "</em>.where" style callback, respectively.</li>
<li><code>[thisArg]</code> <em>(*)</em>: The <code>this</code> binding of <code>callback</code>.</li>
</ol>
<h4>Returns</h4>
<p><em>(Object)</em>: Returns the composed aggregate object.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div>_<span class="delimiter method">.</span><span class="name">countBy</span>([<span class="numeric">4<span class="delimiter">.</span>3</span><span class="delimiter">,</span> <span class="numeric">6<span class="delimiter">.</span>1</span><span class="delimiter">,</span> <span class="numeric">6<span class="delimiter">.</span>4</span>]<span class="delimiter">,</span> <span class="type">function</span>(num) { return <span class="support">Math</span><span class="delimiter method">.</span><span class="support">floor</span>(num); });</div><div><span class="comment">// => { '4': 1, '6': 2 }</span></div><div> </div><div>_<span class="delimiter method">.</span><span class="name">countBy</span>([<span class="numeric">4<span class="delimiter">.</span>3</span><span class="delimiter">,</span> <span class="numeric">6<span class="delimiter">.</span>1</span><span class="delimiter">,</span> <span class="numeric">6<span class="delimiter">.</span>4</span>]<span class="delimiter">,</span> <span class="type">function</span>(num) { return this<span class="delimiter method">.</span><span class="name">floor</span>(num); }<span class="delimiter">,</span> <span class="support">Math</span>);</div><div><span class="comment">// => { '4': 1, '6': 2 }</span></div><div> </div><div>_<span class="delimiter method">.</span><span class="name">countBy</span>([<span class="string">'one'</span><span class="delimiter">,</span> <span class="string">'two'</span><span class="delimiter">,</span> <span class="string">'three'</span>]<span class="delimiter">,</span> <span class="string">'length'</span>);</div><div><span class="comment">// => { '3': 2, '5': 1 }</span></div></pre></div>
</div>
<div>
<h3 id="every"><a href="#every" class="fa fa-link"></a><code>_.every(collection, [callback=identity], [thisArg])</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L3440">source</a> <a href="https://www.npmjs.com/package/lodash.every">npm package</a></p>
<p>Checks if the given callback returns truey value for <strong>all</strong> elements of
a collection. The callback is bound to <code>thisArg</code> and invoked with three
arguments; <em>(value, index|key, collection)</em>.
<br>
<br>
If a property name is provided for <code>callback</code> the created "<em>.pluck" style
callback will return the property value of the given element.
<br>
<br>
If an object is provided for <code>callback</code> the created "</em>.where" style callback
will return <code>true</code> for elements that have the properties of the given object,
else <code>false</code>.</p>
<h4>Aliases</h4>
<p><em>_.all</em></p>
<h4>Arguments</h4>
<ol>
<li><code>collection</code> <em>(Array|Object|string)</em>: The collection to iterate over.</li>
<li><code>[callback=identity]</code> <em>(Function|Object|string)</em>: The function called per iteration. If a property name or object is provided it will be used to create a "<em>.pluck" or "</em>.where" style callback, respectively.</li>
<li><code>[thisArg]</code> <em>(*)</em>: The <code>this</code> binding of <code>callback</code>.</li>
</ol>
<h4>Returns</h4>
<p><em>(boolean)</em>: Returns <code>true</code> if all elements passed the callback check, else <code>false</code>.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div>_<span class="delimiter method">.</span><span class="name">every</span>([true<span class="delimiter">,</span> <span class="numeric">1</span><span class="delimiter">,</span> null<span class="delimiter">,</span> <span class="string">'yes'</span>]);</div><div><span class="comment">// => false</span></div><div> </div><div><span class="type">var</span> characters = [</div><div>  { <span class="string">'name'</span>: <span class="string">'barney'</span><span class="delimiter">,</span> <span class="string">'age'</span>: <span class="numeric">36</span> }<span class="delimiter">,</span></div><div>  { <span class="string">'name'</span>: <span class="string">'fred'</span><span class="delimiter">,</span>   <span class="string">'age'</span>: <span class="numeric">40</span> }</div><div>];</div><div> </div><div><span class="comment">// using "_.pluck" callback shorthand</span></div><div>_<span class="delimiter method">.</span><span class="name">every</span>(characters<span class="delimiter">,</span> <span class="string">'age'</span>);</div><div><span class="comment">// => true</span></div><div> </div><div><span class="comment">// using "_.where" callback shorthand</span></div><div>_<span class="delimiter method">.</span><span class="name">every</span>(characters<span class="delimiter">,</span> { <span class="string">'age'</span>: <span class="numeric">36</span> });</div><div><span class="comment">// => false</span></div></pre></div>
</div>
<div>
<h3 id="filter"><a href="#filter" class="fa fa-link"></a><code>_.filter(collection, [callback=identity], [thisArg])</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L3501">source</a> <a href="https://www.npmjs.com/package/lodash.filter">npm package</a></p>
<p>Iterates over elements of a collection, returning an array of all elements
the callback returns truey for. The callback is bound to <code>thisArg</code> and
invoked with three arguments; <em>(value, index|key, collection)</em>.
<br>
<br>
If a property name is provided for <code>callback</code> the created "<em>.pluck" style
callback will return the property value of the given element.
<br>
<br>
If an object is provided for <code>callback</code> the created "</em>.where" style callback
will return <code>true</code> for elements that have the properties of the given object,
else <code>false</code>.</p>
<h4>Aliases</h4>
<p><em>_.select</em></p>
<h4>Arguments</h4>
<ol>
<li><code>collection</code> <em>(Array|Object|string)</em>: The collection to iterate over.</li>
<li><code>[callback=identity]</code> <em>(Function|Object|string)</em>: The function called per iteration. If a property name or object is provided it will be used to create a "<em>.pluck" or "</em>.where" style callback, respectively.</li>
<li><code>[thisArg]</code> <em>(*)</em>: The <code>this</code> binding of <code>callback</code>.</li>
</ol>
<h4>Returns</h4>
<p><em>(Array)</em>: Returns a new array of elements that passed the callback check.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div><span class="type">var</span> evens = _<span class="delimiter method">.</span><span class="name">filter</span>([<span class="numeric">1</span><span class="delimiter">,</span> <span class="numeric">2</span><span class="delimiter">,</span> <span class="numeric">3</span><span class="delimiter">,</span> <span class="numeric">4</span><span class="delimiter">,</span> <span class="numeric">5</span><span class="delimiter">,</span> <span class="numeric">6</span>]<span class="delimiter">,</span> <span class="type">function</span>(num) { return num % <span class="numeric">2</span> == <span class="numeric">0</span>; });</div><div><span class="comment">// => [2, 4, 6]</span></div><div> </div><div><span class="type">var</span> characters = [</div><div>  { <span class="string">'name'</span>: <span class="string">'barney'</span><span class="delimiter">,</span> <span class="string">'age'</span>: <span class="numeric">36</span><span class="delimiter">,</span> <span class="string">'blocked'</span>: false }<span class="delimiter">,</span></div><div>  { <span class="string">'name'</span>: <span class="string">'fred'</span><span class="delimiter">,</span>   <span class="string">'age'</span>: <span class="numeric">40</span><span class="delimiter">,</span> <span class="string">'blocked'</span>: true }</div><div>];</div><div> </div><div><span class="comment">// using "_.pluck" callback shorthand</span></div><div>_<span class="delimiter method">.</span><span class="name">filter</span>(characters<span class="delimiter">,</span> <span class="string">'blocked'</span>);</div><div><span class="comment">// => [{ 'name': 'fred', 'age': 40, 'blocked': true }]</span></div><div> </div><div><span class="comment">// using "_.where" callback shorthand</span></div><div>_<span class="delimiter method">.</span><span class="name">filter</span>(characters<span class="delimiter">,</span> { <span class="string">'age'</span>: <span class="numeric">36</span> });</div><div><span class="comment">// => [{ 'name': 'barney', 'age': 36, 'blocked': false }]</span></div></pre></div>
</div>
<div>
<h3 id="find"><a href="#find" class="fa fa-link"></a><code>_.find(collection, [callback=identity], [thisArg])</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L3568">source</a> <a href="https://www.npmjs.com/package/lodash.find">npm package</a></p>
<p>Iterates over elements of a collection, returning the first element that
the callback returns truey for. The callback is bound to <code>thisArg</code> and
invoked with three arguments; <em>(value, index|key, collection)</em>.
<br>
<br>
If a property name is provided for <code>callback</code> the created "<em>.pluck" style
callback will return the property value of the given element.
<br>
<br>
If an object is provided for <code>callback</code> the created "</em>.where" style callback
will return <code>true</code> for elements that have the properties of the given object,
else <code>false</code>.</p>
<h4>Aliases</h4>
<p><em>_.detect, _.findWhere</em></p>
<h4>Arguments</h4>
<ol>
<li><code>collection</code> <em>(Array|Object|string)</em>: The collection to iterate over.</li>
<li><code>[callback=identity]</code> <em>(Function|Object|string)</em>: The function called per iteration. If a property name or object is provided it will be used to create a "<em>.pluck" or "</em>.where" style callback, respectively.</li>
<li><code>[thisArg]</code> <em>(*)</em>: The <code>this</code> binding of <code>callback</code>.</li>
</ol>
<h4>Returns</h4>
<p><em>(*)</em>: Returns the found element, else <code>undefined</code>.</p>
<h4>Example</h4>
<div class="highlight js"><pre><div><span class="type">var</span> characters = [</div><div>  { <span class="string">'name'</span>: <span class="string">'barney'</span><span class="delimiter">,</span>  <span class="string">'age'</span>: <span class="numeric">36</span><span class="delimiter">,</span> <span class="string">'blocked'</span>: false }<span class="delimiter">,</span></div><div>  { <span class="string">'name'</span>: <span class="string">'fred'</span><span class="delimiter">,</span>    <span class="string">'age'</span>: <span class="numeric">40</span><span class="delimiter">,</span> <span class="string">'blocked'</span>: true }<span class="delimiter">,</span></div><div>  { <span class="string">'name'</span>: <span class="string">'pebbles'</span><span class="delimiter">,</span> <span class="string">'age'</span>: <span class="numeric">1</span><span class="delimiter">,</span>  <span class="string">'blocked'</span>: false }</div><div>];</div><div> </div><div>_<span class="delimiter method">.</span><span class="support">find</span>(characters<span class="delimiter">,</span> <span class="type">function</span>(chr) {</div><div>  return chr<span class="delimiter">.</span>age < <span class="numeric">40</span>;</div><div>});</div><div><span class="comment">// => { 'name': 'barney', 'age': 36, 'blocked': false }</span></div><div> </div><div><span class="comment">// using "_.where" callback shorthand</span></div><div>_<span class="delimiter method">.</span><span class="support">find</span>(characters<span class="delimiter">,</span> { <span class="string">'age'</span>: <span class="numeric">1</span> });</div><div><span class="comment">// =>  { 'name': 'pebbles', 'age': 1, 'blocked': false }</span></div><div> </div><div><span class="comment">// using "_.pluck" callback shorthand</span></div><div>_<span class="delimiter method">.</span><span class="support">find</span>(characters<span class="delimiter">,</span> <span class="string">'blocked'</span>);</div><div><span class="comment">// => { 'name': 'fred', 'age': 40, 'blocked': true }</span></div></pre></div>
</div>
<div>
<h3 id="findLast"><a href="#findLast" class="fa fa-link"></a><code>_.findLast(collection, [callback=identity], [thisArg])</code></h3>
<p><a href="https://github.com/lodash/lodash/blob/2.4.2/lodash.js#L3613">source</a> <a href="https://www.npmjs.com/package/lodash.findlast">npm package</a></p>
<p>This method is like <a href="#find"><code>_.find</code></a> except that it iterates over elements
of a <code>collection</code> from right to left.</p>
<h4>Arguments</h4>
<ol>
<li><code>collection</code> <em>(Array|Object|string)</em>: The collection to iterate over.</li>