for in vs for

JavaScript performance comparison

Test case created

Preparation code

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

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Testing in unknown unknown
Test Ops/sec
for in
for ( it in ar ) {
    var a = ar[it];
}
pending…
for
for ( var i = 0; i < ar.length; i++ ) {
    var a = ar[i];
}
pending…

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