HORIZON PROJECT

var baseAssignValue = require('./_baseAssignValue'),

    createAggregator = require('./_createAggregator');

/**

 * Creates an object composed of keys generated from the results of running

 * each element of `collection` thru `iteratee`. The corresponding value of

 * each key is the last element responsible for generating the key. The

 * iteratee is invoked with one argument: (value).

 *

 * @static

 * @memberOf _

 * @since 4.0.0

 * @category Collection

 * @param {Array|Object} collection The collection to iterate over.

 * @param {Function} [iteratee=_.identity] The iteratee to transform keys.

 * @returns {Object} Returns the composed aggregate object.

 * @example

 *

 * var array = [

 *   { 'dir': 'left', 'code': 97 },

 *   { 'dir': 'right', 'code': 100 }

 * ];

 *

 * _.keyBy(array, function(o) {

 *   return String.fromCharCode(o.code);

 * });

 * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }

 *

 * _.keyBy(array, 'dir');

 * // => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } }

 */

var keyBy = createAggregator(function(result, value, key) {

  baseAssignValue(result, key, value);

});

module.exports = keyBy;