perf/perf.js

(function(window) {

  /** Use a single load function */
  var load = typeof require == 'function' ? require : window.load;

  /** Load Benchmark.js */
  var Benchmark =
    window.Benchmark || (
      Benchmark = load('../vendor/benchmark.js/benchmark.js') || window.Benchmark,
      Benchmark.Benchmark || Benchmark
    );

  /** Load Lo-Dash */
  var lodash =
    window.lodash || (
      lodash = load('../lodash.js') || window._,
      lodash = lodash._ || lodash,
      lodash.noConflict()
    );

  /** Load Underscore */
  var _ =
    window._ || (
      _ = load('../vendor/underscore/underscore.js') || window._,
      _._ || _
    );

  /** Used to access the Firebug Lite panel (set by `run`) */
  var fbPanel;

  /** Used to score Lo-Dash and Underscore performance */
  var score = { 'lodash': 0, 'underscore': 0 };

  /** Used to queue benchmark suites */
  var suites = [];

  /** Add `console.log()` support for Narwhal and RingoJS */
  window.console || (window.console = { 'log': window.print });

  /** Expose functions to the global object */
  window._ = _;
  window.Benchmark = Benchmark;
  window.lodash = lodash;

  /*--------------------------------------------------------------------------*/

  /**
   * Gets the Hz, i.e. operations per second, of `bench` adjusted for the
   * margin of error.
   *
   * @private
   * @param {Object} bench The benchmark object.
   * @returns {Number} Returns the adjusted Hz.
   */
  function getHz(bench) {
    return 1 / (bench.stats.mean + bench.stats.moe);
  }

  /**
   * Logs text to the console.
   *
   * @private
   * @param {String} text The text to log.
   */
  function log(text) {
    console.log(text);
    if (fbPanel) {
      // scroll the Firebug Lite panel down
      fbPanel.scrollTop = fbPanel.scrollHeight;
    }
  }

  /**
   * Runs all benchmark suites.
   *
   * @private (@public in the browser)
   */
  function run() {
    fbPanel = (fbPanel = window.document && document.getElementById('FirebugUI')) &&
      (fbPanel = (fbPanel = fbPanel.contentWindow || fbPanel.contentDocument).document || fbPanel) &&
      fbPanel.getElementById('fbPanel1');

    log('\nSit back and relax, this may take a while.');
    suites[0].run();
  }

  /*--------------------------------------------------------------------------*/

  lodash.extend(Benchmark.options, {
    'async': true,
    'setup': function() {
      var window = Function('return this || global')(),
          _ = window._,
          lodash = window.lodash,
          belt = this.name == 'Lo-Dash' ? lodash : _;

      var index,
          limit = 20,
          object = {},
          objects = Array(limit),
          numbers = Array(limit),
          fourNumbers = [5, 25, 10, 30],
          nestedNumbers = [1, [2], [3, [[4]]]],
          twoNumbers = [12, 21];

      for (index = 0; index < limit; index++) {
        numbers[index] = index;
        object['key' + index] = index;
        objects[index] = { 'num': index };
      }

      if (typeof bind != 'undefined') {
        var contextObject = { 'name': 'moe' },
            ctor = function() {};

        var func = function(greeting, punctuation) {
          return greeting + ', ' + this.name + (punctuation || '.');
        };

        var lodashBoundNormal = lodash.bind(func, contextObject),
            lodashBoundCtor = lodash.bind(ctor, contextObject),
            lodashBoundPartial = lodash.bind(func, contextObject, 'hi');

        var _boundNormal = _.bind(func, contextObject),
            _boundCtor = _.bind(ctor, contextObject),
            _boundPartial = _.bind(func, contextObject, 'hi');
      }

      if (typeof bindAll != 'undefined') {
        var bindAllObjects = Array(this.count),
            funcNames = belt.functions(lodash);

        // potentially expensive
        for (index = 0; index < this.count; index++) {
          bindAllObjects[index] = belt.clone(lodash);
        }
      }

      if (typeof groupBy != 'undefined') {
        var wordToNumber = {
          'one': 1,
          'two': 2,
          'three': 3,
          'four': 4,
          'five': 5,
          'six': 6,
          'seven': 7,
          'eight': 8,
          'nine': 9,
          'ten': 10,
          'eleven': 11,
          'twelve': 12,
          'thirteen': 13,
          'fourteen': 14,
          'fifteen': 15,
          'sixteen': 16,
          'seventeen': 17,
          'eighteen': 18,
          'nineteen': 19,
          'twenty': 20,
          'twenty-one': 21,
          'twenty-two': 22,
          'twenty-three': 23,
          'twenty-four': 24,
          'twenty-five': 25
        };

        var words = belt.keys(wordToNumber).slice(0, limit);
      }

      if (typeof isEqual != 'undefined') {
        var objectOfPrimitives = {
          'boolean': true,
          'number': 1,
          'string': 'a'
        };

        var objectOfObjects = {
          'boolean': new Boolean(true),
          'number': new Number(1),
          'string': new String('a')
        };

        var object2 = {},
            objects2 = Array(limit),
            numbers2 = Array(limit),
            nestedNumbers2 = [1, [2], [3, [[4]]]];

        for (index = 0; index < limit; index++) {
          numbers2[index] = index;
          object2['key' + index] = index;
          objects2[index] = { 'num': index };
        }
      }

      if (typeof multiArrays != 'undefined') {
        var twentyFiveValues = Array(25),
            twentyFiveValues2 = Array(25),
            fiftyValues = Array(50),
            fiftyValues2 = Array(50),
            seventyFiveValues = Array(75),
            seventyFiveValues2 = Array(75),
            lowerChars = 'abcdefghijklmnopqrstuvwxyz'.split(''),
            upperChars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.split('');

        for (index = 0; index < 75; index++) {
          if (index < 26) {
            if (index < 20) {
              twentyFiveValues[index] = lowerChars[index];
              twentyFiveValues2[index] = upperChars[index];
            }
            else if (index < 25) {
              twentyFiveValues[index] =
              twentyFiveValues2[index] = index;
            }
            fiftyValues[index] =
            seventyFiveValues[index] = lowerChars[index];

            fiftyValues2[index] =
            seventyFiveValues2[index] = upperChars[index];
          }
          else {
            if (index < 50) {
              fiftyValues[index] = index;
              fiftyValues2[index] = index + (index < 40 ? 75 : 0);
            }
            seventyFiveValues[index] = index;
            seventyFiveValues2[index] = index + (index < 60 ? 75 : 0);
          }
        }
      }

      if (typeof template != 'undefined') {
        var tplData = {
          'header1': 'Header1',
          'header2': 'Header2',
          'header3': 'Header3',
          'header4': 'Header4',
          'header5': 'Header5',
          'header6': 'Header6',
          'list': ['1', '2', '3', '4', '5', '6', '7', '8', '9', '10']
        };

        var tplBase =
          '<div>' +
          "<h1 class='header1'><%= header1 %></h1>" +
          "<h2 class='header2'><%= header2 %></h2>" +
          "<h3 class='header3'><%= header3 %></h3>" +
          "<h4 class='header4'><%= header4 %></h4>" +
          "<h5 class='header5'><%= header5 %></h5>" +
          "<h6 class='header6'><%= header6 %></h6>";

        var tpl =
          tplBase +
          "<ul class='list'>" +
          "<li class='item'><%= list[0] %></li>" +
          "<li class='item'><%= list[1] %></li>" +
          "<li class='item'><%= list[2] %></li>" +
          "<li class='item'><%= list[3] %></li>" +
          "<li class='item'><%= list[4] %></li>" +
          "<li class='item'><%= list[5] %></li>" +
          "<li class='item'><%= list[6] %></li>" +
          "<li class='item'><%= list[7] %></li>" +
          "<li class='item'><%= list[8] %></li>" +
          "<li class='item'><%= list[9] %></li>" +
          '</ul>' +
          '</div>';

        var tplWithEvaluate =
          tplBase +
          "<ul class='list'>" +
          '<% for (var index = 0, length = list.length; index < length; index++) { %>' +
          "<li class='item'><%= list[index] %></li>" +
          '<% } %>' +
          '</ul>' +
          '</div>';

        var tplBaseVerbose =
          '<div>' +
          "<h1 class='header1'><%= data.header1 %></h1>" +
          "<h2 class='header2'><%= data.header2 %></h2>" +
          "<h3 class='header3'><%= data.header3 %></h3>" +
          "<h4 class='header4'><%= data.header4 %></h4>" +
          "<h5 class='header5'><%= data.header5 %></h5>" +
          "<h6 class='header6'><%= data.header6 %></h6>";

        var tplVerbose =
          tplBaseVerbose +
          "<ul class='list'>" +
          "<li class='item'><%= data.list[0] %></li>" +
          "<li class='item'><%= data.list[1] %></li>" +
          "<li class='item'><%= data.list[2] %></li>" +
          "<li class='item'><%= data.list[3] %></li>" +
          "<li class='item'><%= data.list[4] %></li>" +
          "<li class='item'><%= data.list[5] %></li>" +
          "<li class='item'><%= data.list[6] %></li>" +
          "<li class='item'><%= data.list[7] %></li>" +
          "<li class='item'><%= data.list[8] %></li>" +
          "<li class='item'><%= data.list[9] %></li>" +
          '</ul>' +
          '</div>';

        var tplVerboseWithEvaluate =
          tplBaseVerbose +
          "<ul class='list'>" +
          '<% for (var index = 0, length = data.list.length; index < length; index++) { %>' +
          "<li class='item'><%= data.list[index] %></li>" +
          '<% } %>' +
          '</ul>' +
          '</div>';

        var settingsObject = { 'variable': 'data' };

        var lodashTpl = lodash.template(tpl),
            lodashTplWithEvaluate = lodash.template(tplWithEvaluate),
            lodashTplVerbose = lodash.template(tplVerbose, null, settingsObject),
            lodashTplVerboseWithEvaluate = lodash.template(tplVerboseWithEvaluate, null, settingsObject);

        var _tpl = _.template(tpl),
            _tplWithEvaluate = _.template(tplWithEvaluate),
            _tplVerbose = _.template(tplVerbose, null, settingsObject),
            _tplVerboseWithEvaluate = _.template(tplVerboseWithEvaluate, null, settingsObject);
      }
    }
  });

  lodash.extend(Benchmark.Suite.options, {
    'onStart': function() {
      log('\n' + this.name + ':');
    },
    'onCycle': function(event) {
      log(event.target + '');
    },
    'onComplete': function() {
      var formatNumber = Benchmark.formatNumber,
          fastest = this.filter('fastest'),
          fastestHz = getHz(fastest[0]),
          slowest = this.filter('slowest'),
          slowestHz = getHz(slowest[0]),
          lodashHz = getHz(this[0]),
          underscoreHz = getHz(this[1]);

      if (fastest.length > 1) {
        log('It\'s too close to call.');
        lodashHz = underscoreHz = slowestHz;
      }
      else {
        var percent = ((fastestHz / slowestHz) - 1) * 100;

        log(
          fastest[0].name + ' is ' +
          formatNumber(percent < 1 ? percent.toFixed(2) : Math.round(percent)) +
          '% faster.'
        );
      }
      // add score adjusted for margin of error
      score.lodash += lodashHz;
      score.underscore += underscoreHz;

      // remove current suite from queue
      suites.shift();

      if (suites.length) {
        // run next suite
        suites[0].run();
      }
      else {
        var fastestTotalHz = Math.max(score.lodash, score.underscore),
            slowestTotalHz = Math.min(score.lodash, score.underscore),
            totalPercent = formatNumber(Math.round(((fastestTotalHz  / slowestTotalHz) - 1) * 100)),
            totalX = fastestTotalHz / slowestTotalHz,
            message = ' is ' + totalPercent + '% ' + (totalX == 1 ? '' : '(' + formatNumber(totalX.toFixed(2)) + 'x) ') + 'faster than ';

        // report results
        if (score.lodash >= score.underscore) {
          log('\nLo-Dash' + message + 'Underscore.');
        } else {
          log('\nUnderscore' + message + 'Lo-Dash.');
        }
      }
    }
  });

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.bind` (uses native `Function#bind` if available and inferred fast)')
      .add('Lo-Dash', {
        'fn': function() {
          lodash.bind(func, { 'name': 'moe' }, 'hi');
        },
        'teardown': 'function bind(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _.bind(func, { 'name': 'moe' }, 'hi');
        },
        'teardown': 'function bind(){}'
      })
  );

  suites.push(
    Benchmark.Suite('bound call')
      .add('Lo-Dash', {
        'fn': function() {
          lodashBoundNormal();
        },
        'teardown': 'function bind(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _boundNormal();
        },
        'teardown': 'function bind(){}'
      })
  );

  suites.push(
    Benchmark.Suite('bound call with arguments')
      .add('Lo-Dash', {
        'fn': function() {
          lodashBoundNormal('hi', '!');
        },
        'teardown': 'function bind(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _boundNormal('hi', '!');
        },
        'teardown': 'function bind(){}'
      })
  );

  suites.push(
    Benchmark.Suite('bound and partially applied call (uses native `Function#bind` if available)')
      .add('Lo-Dash', {
        'fn': function() {
          lodashBoundPartial();
        },
        'teardown': 'function bind(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _boundPartial();
        },
        'teardown': 'function bind(){}'
      })
  );

  suites.push(
    Benchmark.Suite('bound and partially applied call with arguments (uses native `Function#bind` if available)')
      .add('Lo-Dash', {
        'fn': function() {
          lodashBoundPartial('!');
        },
        'teardown': 'function bind(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _boundPartial('!');
        },
        'teardown': 'function bind(){}'
      })
  );

  suites.push(
    Benchmark.Suite('bound and called in a `new` expression, i.e. `new bound` (edge case)')
      .add('Lo-Dash', {
        'fn': function() {
          new lodashBoundCtor();
        },
        'teardown': 'function bind(){}'
      })
      .add('Underscore', {
        'fn': function() {
          new _boundCtor();
        },
        'teardown': 'function bind(){}'
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.bindAll` iterating arguments')
      .add('Lo-Dash', {
        'fn': function() {
          lodash.bindAll.apply(lodash, [bindAllObjects.pop()].concat(funcNames));
        },
        'teardown': 'function bindAll(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _.bindAll.apply(_, [bindAllObjects.pop()].concat(funcNames));
        },
        'teardown': 'function bindAll(){}'
      })
  );

  suites.push(
    Benchmark.Suite('`_.bindAll` iterating the `object`')
      .add('Lo-Dash', {
        'fn': function() {
          lodash.bindAll(bindAllObjects.pop());
        },
        'teardown': 'function bindAll(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _.bindAll(bindAllObjects.pop());
        },
        'teardown': 'function bindAll(){}'
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.difference`')
      .add('Lo-Dash', function() {
        lodash.difference(numbers, fourNumbers, twoNumbers);
      })
      .add('Underscore', function() {
        _.difference(numbers, fourNumbers, twoNumbers);
      })
  );

  suites.push(
    Benchmark.Suite('`_.difference` iterating 25 elements')
      .add('Lo-Dash', {
        'fn': function() {
          lodash.difference(twentyFiveValues, twentyFiveValues2);
        },
        'teardown': 'function multiArrays(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _.difference(twentyFiveValues, twentyFiveValues2);
        },
        'teardown': 'function multiArrays(){}'
      })
  );

  suites.push(
    Benchmark.Suite('`_.difference` iterating 50 elements')
      .add('Lo-Dash', {
        'fn': function() {
          lodash.difference(fiftyValues, fiftyValues2);
        },
        'teardown': 'function multiArrays(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _.difference(fiftyValues, fiftyValues2);
        },
        'teardown': 'function multiArrays(){}'
      })
  );

  suites.push(
    Benchmark.Suite('`_.difference` iterating 75 elements')
      .add('Lo-Dash', {
        'fn': function() {
          lodash.difference(seventyFiveValues, seventyFiveValues2);
        },
        'teardown': 'function multiArrays(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _.difference(seventyFiveValues, seventyFiveValues2);
        },
        'teardown': 'function multiArrays(){}'
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.each` iterating an array')
      .add('Lo-Dash', function() {
        var result = [];
        lodash.each(numbers, function(num) {
          result.push(num * 2);
        });
      })
      .add('Underscore', function() {
        var result = [];
        _.each(numbers, function(num) {
          result.push(num * 2);
        });
      })
  );

  suites.push(
    Benchmark.Suite('`_.each` iterating an array with `thisArg` (slow path)')
      .add('Lo-Dash', function() {
        var result = [];
        lodash.each(numbers, function(num, index) {
          result.push(num + this['key' + index]);
        }, object);
      })
      .add('Underscore', function() {
        var result = [];
        _.each(numbers, function(num, index) {
          result.push(num + this['key' + index]);
        }, object);
      })
  );

  suites.push(
    Benchmark.Suite('`_.each` iterating an object')
      .add('Lo-Dash', function() {
        var result = [];
        lodash.each(object, function(num) {
          result.push(num * 2);
        });
      })
      .add('Underscore', function() {
        var result = [];
        _.each(object, function(num) {
          result.push(num * 2);
        });
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.filter` iterating an array')
      .add('Lo-Dash', function() {
        lodash.filter(numbers, function(num) {
          return num % 2;
        });
      })
      .add('Underscore', function() {
        _.filter(numbers, function(num) {
          return num % 2;
        });
      })
  );

  suites.push(
    Benchmark.Suite('`_.filter` iterating an array with `thisArg` (slow path)')
      .add('Lo-Dash', function() {
        lodash.filter(numbers, function(num, index) {
          return this['key' + index] % 2;
        }, object);
      })
      .add('Underscore', function() {
        _.filter(numbers, function(num, index) {
           return this['key' + index] % 2;
        }, object);
      })
  );

  suites.push(
    Benchmark.Suite('`_.filter` iterating an object')
      .add('Lo-Dash', function() {
        lodash.filter(object, function(num) {
          return num % 2;
        });
      })
      .add('Underscore', function() {
        _.filter(object, function(num) {
          return num % 2;
        });
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.find` iterating an array')
      .add('Lo-Dash', function() {
        lodash.find(numbers, function(num) {
          return num === 19;
        });
      })
      .add('Underscore', function() {
        _.find(numbers, function(num) {
          return num === 19;
        });
      })
  );

  suites.push(
    Benchmark.Suite('`_.find` iterating an object')
      .add('Lo-Dash', function() {
        lodash.find(object, function(value, key) {
          return /\D9$/.test(key);
        });
      })
      .add('Underscore', function() {
        _.find(object, function(value, key) {
          return /\D9$/.test(key);
        });
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.flatten`')
      .add('Lo-Dash', function() {
        lodash.flatten(nestedNumbers);
      })
      .add('Underscore', function() {
        _.flatten(nestedNumbers);
      })
  );

  suites.push(
    Benchmark.Suite('`_.flatten` with `shallow`')
      .add('Lo-Dash', function() {
        lodash.flatten(nestedNumbers, true);
      })
      .add('Underscore', function() {
        _.flatten(nestedNumbers, true);
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.functions`')
      .add('Lo-Dash', function() {
        lodash.functions(lodash);
      })
      .add('Underscore', function() {
        _.functions(lodash);
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.groupBy` with `callback` iterating an array')
      .add('Lo-Dash', function() {
        lodash.groupBy(numbers, function(num) { return num >> 1; });
      })
      .add('Underscore', function() {
        _.groupBy(numbers, function(num) { return num >> 1; });
      })
  );

  suites.push(
    Benchmark.Suite('`_.groupBy` with `property` name iterating an array')
      .add('Lo-Dash', {
        'fn': function() {
          lodash.groupBy(words, 'length');
        },
        'teardown': 'function groupBy(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _.groupBy(words, 'length');
        },
        'teardown': 'function groupBy(){}'
      })
  );

  suites.push(
    Benchmark.Suite('`_.groupBy` with `callback` iterating an object')
      .add('Lo-Dash', {
        'fn': function() {
          lodash.groupBy(wordToNumber, function(num) { return num >> 1; });
        },
        'teardown': 'function groupBy(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _.groupBy(wordToNumber, function(num) { return num >> 1; });
        },
        'teardown': 'function groupBy(){}'
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.indexOf`')
      .add('Lo-Dash', function() {
        lodash.indexOf(numbers, 9);
      })
      .add('Underscore', function() {
        _.indexOf(numbers, 9);
      })
  );

  suites.push(
    Benchmark.Suite('`_.indexOf` with `isSorted`')
      .add('Lo-Dash', function() {
        lodash.indexOf(numbers, 19, true);
      })
      .add('Underscore', function() {
        _.indexOf(numbers, 19, true);
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.intersection`')
      .add('Lo-Dash', function() {
        lodash.intersection(numbers, fourNumbers, twoNumbers);
      })
      .add('Underscore', function() {
        _.intersection(numbers, fourNumbers, twoNumbers);
      })
  );

  suites.push(
    Benchmark.Suite('`_.intersection` iterating 25 elements')
      .add('Lo-Dash', {
        'fn': function() {
          lodash.intersection(twentyFiveValues, twentyFiveValues2);
        },
        'teardown': 'function multiArrays(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _.intersection(twentyFiveValues, twentyFiveValues2);
        },
        'teardown': 'function multiArrays(){}'
      })
  );

  suites.push(
    Benchmark.Suite('`_.intersection` iterating 50 elements')
      .add('Lo-Dash', {
        'fn': function() {
          lodash.intersection(fiftyValues, fiftyValues2);
        },
        'teardown': 'function multiArrays(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _.intersection(fiftyValues, fiftyValues2);
        },
        'teardown': 'function multiArrays(){}'
      })
  );

  suites.push(
    Benchmark.Suite('`_.intersection` iterating 75 elements')
      .add('Lo-Dash', {
        'fn': function() {
          lodash.intersection(seventyFiveValues, seventyFiveValues2);
        },
        'teardown': 'function multiArrays(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _.intersection(seventyFiveValues, seventyFiveValues2);
        },
        'teardown': 'function multiArrays(){}'
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.invoke` iterating an array')
      .add('Lo-Dash', function() {
        lodash.invoke(numbers, 'toFixed', '2');
      })
      .add('Underscore', function() {
        _.invoke(numbers, 'toFixed', '2');
      })
  );

  suites.push(
    Benchmark.Suite('`_.invoke` with a function for `methodName` iterating an array')
      .add('Lo-Dash', function() {
        lodash.invoke(numbers, String.prototype.split, '');
      })
      .add('Underscore', function() {
        _.invoke(numbers, String.prototype.split, '');
      })
  );

  suites.push(
    Benchmark.Suite('`_.invoke` iterating an object')
      .add('Lo-Dash', function() {
        lodash.invoke(object, 'toFixed', '2');
      })
      .add('Underscore', function() {
        _.invoke(object, 'toFixed', '2');
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.isEqual` comparing primitives and objects (edge case)')
      .add('Lo-Dash', {
        'fn': function() {
          lodash.isEqual(objectOfPrimitives, objectOfObjects);
        },
        'teardown': 'function isEqual(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _.isEqual(objectOfPrimitives, objectOfObjects);
        },
        'teardown': 'function isEqual(){}'
      })
  );

  suites.push(
    Benchmark.Suite('`_.isEqual` comparing arrays')
      .add('Lo-Dash', {
        'fn': function() {
          lodash.isEqual(numbers, numbers2);
        },
        'teardown': 'function isEqual(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _.isEqual(numbers, numbers2);
        },
        'teardown': 'function isEqual(){}'
      })
  );

  suites.push(
    Benchmark.Suite('`_.isEqual` comparing nested arrays')
      .add('Lo-Dash', {
        'fn': function() {
          lodash.isEqual(nestedNumbers, nestedNumbers2);
        },
        'teardown': 'function isEqual(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _.isEqual(nestedNumbers, nestedNumbers2);
        },
        'teardown': 'function isEqual(){}'
      })
  );

  suites.push(
    Benchmark.Suite('`_.isEqual` comparing arrays of objects')
      .add('Lo-Dash', {
        'fn': function() {
          lodash.isEqual(objects, objects2);
        },
        'teardown': 'function isEqual(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _.isEqual(objects, objects2);
        },
        'teardown': 'function isEqual(){}'
      })
  );

  suites.push(
    Benchmark.Suite('`_.isEqual` comparing objects')
      .add('Lo-Dash', {
        'fn': function() {
          lodash.isEqual(object, object2);
        },
        'teardown': 'function isEqual(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _.isEqual(object, object2);
        },
        'teardown': 'function isEqual(){}'
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.keys` (uses native `Object.keys` if available)')
      .add('Lo-Dash', function() {
        lodash.keys(object);
      })
      .add('Underscore', function() {
        _.keys(object);
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.lastIndexOf`')
      .add('Lo-Dash', function() {
        lodash.lastIndexOf(numbers, 9);
      })
      .add('Underscore', function() {
        _.lastIndexOf(numbers, 9);
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.map` iterating an array')
      .add('Lo-Dash', function() {
        lodash.map(objects, function(value) {
          return value.num;
        });
      })
      .add('Underscore', function() {
        _.map(objects, function(value) {
          return value.num;
        });
      })
  );

  suites.push(
    Benchmark.Suite('`_.map` with `thisArg` iterating an array (slow path)')
      .add('Lo-Dash', function() {
        lodash.map(objects, function(value, index) {
          return this['key' + index] + value.num;
        }, object);
      })
      .add('Underscore', function() {
        _.map(objects, function(value, index) {
          return this['key' + index] + value.num;
        }, object);
      })
  );

  suites.push(
    Benchmark.Suite('`_.map` iterating an object')
      .add('Lo-Dash', function() {
        lodash.map(object, function(value) {
          return value;
        });
      })
      .add('Underscore', function() {
        _.map(object, function(value) {
          return value;
        });
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.max`')
      .add('Lo-Dash', function() {
        lodash.max(numbers);
      })
      .add('Underscore', function() {
        _.max(numbers);
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.min`')
      .add('Lo-Dash', function() {
        lodash.min(numbers);
      })
      .add('Underscore', function() {
        _.min(numbers);
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.pick`')
      .add('Lo-Dash', function() {
        lodash.pick(object, 'key6', 'key13');
      })
      .add('Underscore', function() {
        _.pick(object, 'key6', 'key13');
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.pluck`')
      .add('Lo-Dash', function() {
        lodash.pluck(objects, 'num');
      })
      .add('Underscore', function() {
        _.pluck(objects, 'num');
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.shuffle`')
      .add('Lo-Dash', function() {
        lodash.shuffle(numbers);
      })
      .add('Underscore', function() {
        _.shuffle(numbers);
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.size` with an array')
      .add('Lo-Dash', function() {
        lodash.size(numbers);
      })
      .add('Underscore', function() {
        _.size(numbers);
      })
  );

  suites.push(
    Benchmark.Suite('`_.size` with an object')
      .add('Lo-Dash', function() {
        lodash.size(object);
      })
      .add('Underscore', function() {
        _.size(object);
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.sortBy` with `callback`')
      .add('Lo-Dash', function() {
        lodash.sortBy(numbers, function(num) { return Math.sin(num); });
      })
      .add('Underscore', function() {
        _.sortBy(numbers, function(num) { return Math.sin(num); });
      })
  );

  suites.push(
    Benchmark.Suite('`_.sortBy` with `callback` and `thisArg` (slow path)')
      .add('Lo-Dash', function() {
        lodash.sortBy(numbers, function(num) { return this.sin(num); }, Math);
      })
      .add('Underscore', function() {
        _.sortBy(numbers, function(num) { return this.sin(num); }, Math);
      })
  );

  suites.push(
    Benchmark.Suite('`_.sortBy` with `property` name')
      .add('Lo-Dash', {
        'fn': function() {
          lodash.sortBy(words, 'length');
        },
        'teardown': 'function groupBy(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _.sortBy(words, 'length');
        },
        'teardown': 'function groupBy(){}'
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.sortedIndex`')
      .add('Lo-Dash', function() {
        lodash.sortedIndex(numbers, 25);
      })
      .add('Underscore', function() {
        _.sortedIndex(numbers, 25);
      })
  );

  suites.push(
    Benchmark.Suite('`_.sortedIndex` with `callback`')
      .add('Lo-Dash', {
        'fn': function() {
          lodash.sortedIndex(words, 'twenty-five', function(value) {
            return wordToNumber[value];
          });
        },
        'teardown': 'function groupBy(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _.sortedIndex(words, 'twenty-five', function(value) {
            return wordToNumber[value];
          });
        },
        'teardown': 'function groupBy(){}'
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.template` without "evaluate" delimiters (slow path)')
      .add('Lo-Dash', {
        'fn': function() {
          lodash.template(tpl, tplData);
        },
        'teardown': 'function template(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _.template(tpl, tplData);
        },
        'teardown': 'function template(){}'
      })
  );

  suites.push(
    Benchmark.Suite('`_.template` with "evaluate" delimiters (slow path)')
      .add('Lo-Dash', {
        'fn': function() {
          lodash.template(tplWithEvaluate, tplData);
        },
        'teardown': 'function template(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _.template(tplWithEvaluate, tplData);
        },
        'teardown': 'function template(){}'
      })
  );

  suites.push(
    Benchmark.Suite('compiled template without "evaluate" delimiters')
      .add('Lo-Dash', {
        'fn': function() {
          lodashTpl(tplData);
        },
        'teardown': 'function template(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _tpl(tplData);
        },
        'teardown': 'function template(){}'
      })
  );

  suites.push(
    Benchmark.Suite('compiled template with "evaluate" delimiters')
      .add('Lo-Dash', {
        'fn': function() {
          lodashTplWithEvaluate(tplData);
        },
        'teardown': 'function template(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _tplWithEvaluate(tplData);
        },
        'teardown': 'function template(){}'
      })
  );

  suites.push(
    Benchmark.Suite('compiled template without a with-statement or "evaluate" delimiters')
      .add('Lo-Dash', {
        'fn': function() {
          lodashTplVerbose(tplData);
        },
        'teardown': 'function template(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _tplVerbose(tplData);
        },
        'teardown': 'function template(){}'
      })
  );

  suites.push(
    Benchmark.Suite('compiled template without a with-statement using "evaluate" delimiters')
      .add('Lo-Dash', {
        'fn': function() {
          lodashTplVerboseWithEvaluate(tplData);
        },
        'teardown': 'function template(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _tplVerboseWithEvaluate(tplData);
        },
        'teardown': 'function template(){}'
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.times`')
      .add('Lo-Dash', function() {
        var result = [];
        lodash.times(length, function(n) { result.push(n); });
      })
      .add('Underscore', function() {
        var result = [];
        _.times(length, function(n) { result.push(n); });
      })
  );

  suites.push(
    Benchmark.Suite('`_.times` with `thisArg`')
      .add('Lo-Dash', function() {
        var result = [];
        lodash.times(length, function(n) { result.push(this.sin(n)); }, Math);
      })
      .add('Underscore', function() {
        var result = [];
        _.times(length, function(n) { result.push(this.sin(n)); }, Math);
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.toArray` with an array')
      .add('Lo-Dash', function() {
        lodash.toArray(numbers);
      })
      .add('Underscore', function() {
        _.toArray(numbers);
      })
  );

  suites.push(
    Benchmark.Suite('`_.toArray` with an object')
      .add('Lo-Dash', function() {
        lodash.toArray(object);
      })
      .add('Underscore', function() {
        _.toArray(object);
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.union`')
      .add('Lo-Dash', function() {
        lodash.union(numbers, fourNumbers, twoNumbers);
      })
      .add('Underscore', function() {
        _.union(numbers, fourNumbers, twoNumbers);
      })
  );

  suites.push(
    Benchmark.Suite('`_.union` iterating an array of 25 elements')
      .add('Lo-Dash', {
        'fn': function() {
          lodash.union(twentyFiveValues, twentyFiveValues2);
        },
        'teardown': 'function multiArrays(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _.union(twentyFiveValues, twentyFiveValues2);
        },
        'teardown': 'function multiArrays(){}'
      })
  );

  suites.push(
    Benchmark.Suite('`_.union` iterating an array of 50 elements')
      .add('Lo-Dash', {
        'fn': function() {
          lodash.union(fiftyValues, fiftyValues2);
        },
        'teardown': 'function multiArrays(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _.union(fiftyValues, fiftyValues2);
        },
        'teardown': 'function multiArrays(){}'
      })
  );

  suites.push(
    Benchmark.Suite('`_.union` iterating an array of 75 elements')
      .add('Lo-Dash', {
        'fn': function() {
          lodash.union(seventyFiveValues, seventyFiveValues2);
        },
        'teardown': 'function multiArrays(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _.union(seventyFiveValues, seventyFiveValues2);
        },
        'teardown': 'function multiArrays(){}'
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.uniq`')
      .add('Lo-Dash', function() {
        lodash.uniq(numbers.concat(fourNumbers, twoNumbers));
      })
      .add('Underscore', function() {
        _.uniq(numbers.concat(fourNumbers, twoNumbers));
      })
  );

  suites.push(
    Benchmark.Suite('`_.uniq` with `callback`')
      .add('Lo-Dash', function() {
        lodash.uniq(numbers.concat(fourNumbers, twoNumbers), function(num) {
          return num % 2;
        });
      })
      .add('Underscore', function() {
        _.uniq(numbers.concat(fourNumbers, twoNumbers), function(num) {
          return num % 2;
        });
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.values`')
      .add('Lo-Dash', function() {
        lodash.values(object);
      })
      .add('Underscore', function() {
        _.values(object);
      })
  );

  /*--------------------------------------------------------------------------*/

  suites.push(
    Benchmark.Suite('`_.without`')
      .add('Lo-Dash', function() {
        lodash.without(numbers, 9, 12, 14, 15);
      })
      .add('Underscore', function() {
        _.without(numbers, 9, 12, 14, 15);
      })
  );

  suites.push(
    Benchmark.Suite('`_.without` iterating an array of 25 elements')
      .add('Lo-Dash', {
        'fn': function() {
          lodash.without.apply(lodash, [twentyFiveValues].concat(twentyFiveValues2));
        },
        'teardown': 'function multiArrays(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _.without.apply(_, [twentyFiveValues].concat(twentyFiveValues2));
        },
        'teardown': 'function multiArrays(){}'
      })
  );

  suites.push(
    Benchmark.Suite('`_.without` iterating an array of 50 elements')
      .add('Lo-Dash', {
        'fn': function() {
          lodash.without.apply(lodash, [fiftyValues].concat(fiftyValues2));
        },
        'teardown': 'function multiArrays(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _.without.apply(_, [fiftyValues].concat(fiftyValues2));
        },
        'teardown': 'function multiArrays(){}'
      })
  );

  suites.push(
    Benchmark.Suite('`_.without` iterating an array of 75 elements')
      .add('Lo-Dash', {
        'fn': function() {
          lodash.without.apply(lodash, [seventyFiveValues].concat(seventyFiveValues2));
        },
        'teardown': 'function multiArrays(){}'
      })
      .add('Underscore', {
        'fn': function() {
          _.without.apply(_, [seventyFiveValues].concat(seventyFiveValues2));
        },
        'teardown': 'function multiArrays(){}'
      })
  );

  /*--------------------------------------------------------------------------*/

  if (Benchmark.platform + '') {
    log(Benchmark.platform + '');
  }

  // in the browser, expose `run` to be called later
  if (window.document) {
    window.run = run;
  } else {
    run();
  }
}(typeof global == 'object' && global || this));