array/remove.js

define(['../internal/baseCallback'], function(baseCallback) {

  /** Used for native method references. */
  var arrayProto = Array.prototype;

  /** Native method references. */
  var splice = arrayProto.splice;

  /**
   * Removes all elements from `array` that `predicate` returns truthy for
   * and returns an array of the removed elements. The predicate is bound to
   * `thisArg` and invoked with three arguments; (value, index, array).
   *
   * If a property name is provided for `predicate` the created "_.property"
   * style callback returns the property value of the given element.
   *
   * If an object is provided for `predicate` the created "_.matches" style
   * callback returns `true` for elements that have the properties of the given
   * object, else `false`.
   *
   * **Note:** Unlike `_.filter`, this method mutates `array`.
   *
   * @static
   * @memberOf _
   * @category Array
   * @param {Array} array The array to modify.
   * @param {Function|Object|string} [predicate=_.identity] The function invoked
   *  per iteration. If a property name or object is provided it is used to
   *  create a "_.property" or "_.matches" style callback respectively.
   * @param {*} [thisArg] The `this` binding of `predicate`.
   * @returns {Array} Returns the new array of removed elements.
   * @example
   *
   * var array = [1, 2, 3, 4];
   * var evens = _.remove(array, function(n) { return n % 2 == 0; });
   *
   * console.log(array);
   * // => [1, 3]
   *
   * console.log(evens);
   * // => [2, 4]
   */
  function remove(array, predicate, thisArg) {
    var index = -1,
        length = array ? array.length : 0,
        result = [];

    predicate = baseCallback(predicate, thisArg, 3);
    while (++index < length) {
      var value = array[index];
      if (predicate(value, index, array)) {
        result.push(value);
        splice.call(array, index--, 1);
        length--;
      }
    }
    return result;
  }

  return remove;
});