string concat vs array join

JavaScript performance comparison

Revision 39 of this test case created by artem kustikov

Preparation code


      
      <script>
Benchmark.prototype.setup = function() {
  var words = ['this', 'is', 'a', 'test'];
  
  var text = words[0];
  
  var a = [words[0]];
  
  var i;
  
  var text2;

};
</script>

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
Concat
for(i = 1; i < 10000; ++i)
{
    text += ' ' + words[i & 3];
}

text2 = text;
pending…
Join
for(i = 1; i < 10000; ++i)
{
    a.push(words[i & 3]);
}

text2 = a.join('');
pending…

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