caching length

JavaScript performance comparison

Test case created by feuwhwfeiu

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var arr=[];
    for(var i=0;i<1000;i++) {
      arr[i]=Math.random();
    }
};
</script>

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Testing in unknown unknown
Test Ops/sec
cached
for(var i=0,len=arr.length;i<len;i++) {
  arr[i]*=2;
}
pending…
not cached
for(var i=0;i<arr.length;i++) {
  arr[i]*=2;
}
pending…
u wot m8
var len=2;
len*=arr.length;
len-=len/2;
for(var i=0;i<len;i++) {
  arr[i]*=2;
}
pending…

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