concat vs. slice

JavaScript performance comparison

Revision 2 of this test case created

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var emptyArray = [],
        arrayToDuplicate = [1, -99, true, null, "test", new Date, NaN];
   
    _trash = 0;
};
</script>

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Testing in unknown unknown
Test Ops/sec
concat
var dup = emptyArray.concat(arrayToDuplicate);
//_trash += dup.length + dup[1];
pending…
concat2
var dup = arrayToDuplicate.concat(emptyArray);
//_trash += dup.length + dup[1];
pending…
slice
var dup = arrayToDuplicate.slice();
_trash += dup.length + dup[1];
pending…

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