array create: slice call vs for

JavaScript performance comparison

Revision 8 of this test case created by anonymous

Preparation code

<script>
  var slice = Array.prototype.slice;
</script>
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<script>
  var nodeArr = document.getElementsByTagName("div");
</script>

Preparation code output

Test runner

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Testing in unknown unknown
Test Ops/sec
slice call
var arr = slice.call(nodeArr);
pending…
for
var arr = [];

arr.length = nodeArr.length;

for (var i = 0; arr[i] = nodeArr[i]; i++) {
}
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for pre alloc
var len,
    arr = [];

arr.length = len = nodeArr.length

for (var i = 0; i < len; i++) {
  arr[i] = nodeArr[i];
}
pending…
test4
var len,
    arr = [],
    i = 0;

arr.length = len = nodeArr.length;

while (i < len) {
  arr[i] = nodeArr[i++];
}
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test5
var len,
    arr = [];

arr.length = len = nodeArr.length;

for (var i = len; i--;) {
  arr[i] = nodeArr[i];
}
pending…

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Revisions

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