Caching Array Length

JavaScript performance comparison

Revision 55 of this test case created

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var theArray = [{a:"asd",b:123},{a:"asd",b:123},
     {a:"asd",b:123},
      {a:"asd",b:123}, {a:"asd"}, {a:"asd",b:123},{a:2,b:123},{a:4,b:123},
     {a:"asd",b:123},
      {a:"asd",b:123}, {a:"asd"}, {a:"asd",b:123},{b:13123,b:123},{a:13123,b:123},
     {a:56757,b:123},
      {a:"asd",b:123}, {a:"asd"}, {a:"asd",b:123}
    ];
    var copyOfTheArray = [];
};
</script>

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Testing in unknown unknown
Test Ops/sec
With caching
var len = theArray.length;
for (var i = 0; i < len; i++) {
  copyOfTheArray[i] = theArray[i];
}
pending…
Without caching
for (var i = 0; i < theArray.length; i++) {
  copyOfTheArray[i] = theArray[i];
}
pending…

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