text: /**
   * Lo-Dash 2.3.0 (Custom Build) <http://lodash.com/>
   * Build: `lodash modularize underscore exports="node" -o ./underscore/`
   * Copyright 2012-2013 The Dojo Foundation <http://dojofoundation.org/>
   * Based on Underscore.js 1.5.2 <http://underscorejs.org/LICENSE>
   * Copyright 2009-2013 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
   * Available under MIT license <http://lodash.com/license>
   */
  var createCallback = require('../functions/createCallback'),
      forOwn = require('../objects/forOwn'),
      isArray = require('../objects/isArray');
  
  /**
   * Creates a function that aggregates a collection, creating an object composed
   * of keys generated from the results of running each element of the collection
   * through a callback. The given `setter` function sets the keys and values
   * of the composed object.
   *
   * @private
   * @param {Function} setter The setter function.
   * @returns {Function} Returns the new aggregator function.
   */
  function createAggregator(setter) {
    return function(collection, callback, thisArg) {
      var result = {};
      callback = createCallback(callback, thisArg, 3);
  
      var index = -1,
          length = collection ? collection.length : 0;
  
      if (typeof length == 'number') {
        while (++index < length) {
          var value = collection[index];
          setter(result, value, callback(value, index, collection), collection);
        }
      } else {
        forOwn(collection, function(value, key, collection) {
          setter(result, value, callback(value, key, collection), collection);
        });
      }
      return result;
    };
  }
  
  module.exports = createAggregator;
  