Created
May 31, 2012 21:31
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groupBy in JS
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| Array.prototype.groupBy = function(f) { | |
| var hash = {}; | |
| this.forEach(function(e) { | |
| var result = f(e); | |
| if (hash[result] == undefined) | |
| hash[result] = []; | |
| hash[result].push(e); | |
| }); | |
| return hash; | |
| } |
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