For array existence vs length

JavaScript performance comparison

Test case created by Joshua Koudys

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var ar = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]
};
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
length
for (var i = 0; i < ar.length; i++) {}
pending…
existence
for (var i = 0; ar[i]; i++) {}
pending…
init length
for (var i = 0, len = ar.length; i < len; i++) {}
pending…
Not equal
for (var i = 0; i != ar.length; i++) {}
pending…
Not exactly equal
for (var i = 0; i !== ar.length; i++) {}
pending…
preincrement
for (var i = 0; i < ar.length; ++i) {}
pending…

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