array create: slice call vs for

JavaScript performance comparison

Revision 4 of this test case created

Preparation code

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

Preparation code output

Test runner

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

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Revisions

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