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aclave1/gist:a68fdf84e27c031231f2

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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gistfile1.txt
[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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