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23 lines
559 B
23 lines
559 B
// Inspired by Underscore's groupBy:
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// http://documentcloud.github.com/underscore/#groupBy
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'use strict';
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var callable = require('../../object/valid-callable')
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, value = require('../../object/valid-value')
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, forEach = Array.prototype.forEach, apply = Function.prototype.apply;
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module.exports = function (cb/*, thisArg*/) {
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var r;
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(value(this) && callable(cb));
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r = {};
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forEach.call(this, function (v) {
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var key = apply.call(cb, this, arguments);
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if (!r.hasOwnProperty(key)) r[key] = [];
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r[key].push(v);
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}, arguments[1]);
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return r;
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};
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