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/**
* Copyright (c) 2013-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @typechecks
*/
'use strict';
/**
* Groups all items in the array using the specified function. An object will
* be returned where the keys are the group names, and the values are arrays of
* all the items in that group.
*
* @param {array} array
* @param {function} fn Should return a string with a group name
* @return {object} items grouped using fn
*/
function groupArray(array, fn) {
var ret = {};
for (var ii = 0; ii < array.length; ii++) {
var result = fn.call(array, array[ii], ii);
if (!ret[result]) {
ret[result] = [];
}
ret[result].push(array[ii]);
}
return ret;
}
module.exports = groupArray;
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