Concat vs Push

JavaScript performance comparison

Test case created by Mircea Piturca

Preparation code

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

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Testing in unknown unknown
Test Ops/sec
Concat
a = a.concat(b);
pending…
Push
var i = 0,
    il = b.length;
   
for (; i < il; i += 1) {
  a.push(b[i])
}
pending…

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