Array iteration

JavaScript performance comparison

Test case created by Marco Dias Lopes

Info

Array iteration implementations.

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var a = [1, 2, 3, 4, 5],
        count = 0;
};
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
Traditional for
for(var i = 0; i < a.length; ++i)
{
    count++;
}
pending…
Cached length
for(var i = 0, li = a.length; i < li; ++i)
{
    count++;
}
pending…
Reversed loop
for(var i = a.length; i--; )
{
    count++;
}
pending…

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