array create: slice call vs for

JavaScript performance comparison

Revision 6 of this test case created by Tri

Preparation code

<script>
var slice=Array.prototype.slice;

</script>
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<script>
Benchmark.prototype.setup = function() {
    var nodeArr = document.getElementsByTagName("div");
};
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
slice call
var arr=slice.call(nodeArr);
pending…
for
var arr = [];
for (var i = 0, len = nodeArr.length; i < len; i++) {
  arr.push(nodeArr[i]);
}
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for pre alloc
var len = nodeArr.length,
arr = new Array(len);
for (var i = 0; i < len; i++) {
  arr[i] = nodeArr[i];
}
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test4
  var len=nodeArr.length, arr = new Array(len),i=0;
 
   
   
 while (i <len) {
  arr[i] = nodeArr[i];
i=i+1
}
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test5
 var len=nodeArr.length, arr = new Array(len);



for(var i=len;i--;){

   arr[i] = nodeArr[i];
   
    }
pending…

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Revisions

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