Loops
JavaScript performance comparison
Preparation code
<script>
var arr = new Array(100);
var obj = {length: 100};
var ii = 0;
for(; ii < obj.length; ++ii) { obj[ii] = null }
</script>
Preparation code output
Test runner
Warning! For accurate results, please disable Firebug before running the tests. (Why?)
Java applet disabled.
Test | Ops/sec | |
---|---|---|
while loop that imitates a for loop
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pending… |
while loop that imitates a for loop, caching the length
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pending… |
Reverse
while loop
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pending… |
Reverse
while loop without implicit ToBoolean
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pending… |
Reverse
do … while loop
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pending… |
Reverse
for loop
|
|
pending… |
Old ’n’ busted
for loop
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pending… |
Old ’n’ busted
for loop, caching the length
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pending… |
Cool guy loop
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pending… |
Cool guy loop, caching the length
|
|
pending… |
Native
Array#forEach implementation
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pending… |
Native
Array#forEach implementation with named function
|
|
pending… |
Old 'n' busted with object mimicking array
|
|
pending… |
Old 'n' busted with object mimicking array and cached length
|
|
pending… |
Compare results of other browsers
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