string concat vs array join

JavaScript performance comparison

Revision 6 of this test case created by Schleuse

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
Join
for (i = 1; i < 10000; ++i) {
  a.push(' ', words[i & 3], Math.random());
}

text2 = a.join('');
pending…
Concat
for (i = 1; i < 10000; ++i) {
  text += ' ' + words[i & 3] + Math.random();
}

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

text2 = a.join('');
pending…

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