Concatinate vs Push

JavaScript performance comparison

Test case created by Robert Plummer

Info

Which is faster?

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var str = '',
      arr = [],
      alphabet = 'abcdefghijklmnopqrstuvwxyz'.split(''),
      i = 0,
      r = Math.random,
      f = Math.floor;
};
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
Concatenate
str += alphabet[f(r() * 25) + 1];
pending…
Push
arr.push(alphabet[f(r() * 25) + 1]);
pending…

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