Created
September 1, 2015 14:58
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count the number of times an element occurs in an array
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| [1,2,3,1,1,2,3,4].reduce(function(map,val){ | |
| map[val] = typeof map[val] !== 'undefined' ? map[val]+1 : 1; | |
| return map; | |
| },{}); |
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