count number of each element in array javascript

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Max
29 Oct 2017
1var arr = [5, 5, 5, 2, 2, 2, 2, 2, 9, 4];
2var counts = {};
3
4for (var i = 0; i < arr.length; i++) {
5  var num = arr[i];
6  counts[num] ? counts[num] + 1 : 1;
7}
8
9console.log(counts[5], counts[2], counts[9], counts[4]);
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