aaac7fed
 liuqimichale
add
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// Inspired by Underscore's groupBy:
// http://documentcloud.github.com/underscore/#groupBy
"use strict";
var callable = require("../../object/valid-callable")
, value = require("../../object/valid-value")
, forEach = Array.prototype.forEach
, apply = Function.prototype.apply;
module.exports = function (cb /*, thisArg*/) {
var result;
value(this);
callable(cb);
result = Object.create(null);
forEach.call(
this,
function (item) {
var key = apply.call(cb, this, arguments);
if (!result[key]) result[key] = [];
result[key].push(item);
},
arguments[1]
);
return result;
};
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