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JavaScript performance comparison

Test case created

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var a = {};
    for (var i = 0; i < 10000; i++) {
     a[i] = i;
    }
};
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
keys
var keys = Object.keys(a);
var length = keys.length;
var x = 0;
for (var i = 0; i < length; ++i) {
 var value = a[keys[i]];
 x += value;
}
pending…
for in
var x = 0;
for (key in a) {
 x += a[key];
}
 
pending…

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