concat vs + vs join

JavaScript performance comparison

Revision 4 of this test case created by Wei

Info

How to concat strings faster.

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var coucou = 'Coucou ';
};
</script>

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Testing in unknown unknown
Test Ops/sec
concat
'Coucou '.concat('c\'est ', 'nous !');
pending…
+
'Coucou ' + 'c\'est ' + 'nous !';
pending…
join
['Coucou ', 'c\'est ', 'nous !'].join();
pending…
+=
coucou += 'c\'est ' + 'nous !';
pending…
= then +
coucou = coucou + 'c\'est ' + 'nous !';
pending…

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