modulo vs bitwise

JavaScript performance comparison

Revision 11 of this test case created

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var arr = [];
    var i = 1E4;
   
    while (i--) {
        arr.push(Math.round(Math.random()*1E4));
    }
   
};
</script>

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Testing in unknown unknown
Test Ops/sec
modulo
var j = arr.length;
var x;
while (j--) {
 if (x = arr[j] % 4) {
  arr[j] = x;
 }
}
pending…
bitwise
var j = arr.length;
var x;
while (j--) {
 if (x = (arr[j] & 3)){
  arr[j] = x;
 }
}
pending…

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