Loop vs map vs forEach

JavaScript performance comparison

Revision 26 of this test case created by

Preparation code


      
      <script>
Benchmark.prototype.setup = function() {
  var range = [];
  
  for (var i = 0; i < 10000; i++) {
      range.push({ key: i });
  }

};
</script>

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
Loop
for (var i = 0; i < range.length; i++) {
    range[i].key2 = i * 2;
}
pending…
Map
range = range.map(function(val, i) { return { key: i, key2: i * 2 }; });
pending…
forEach
range.forEach(function(val, i) {
    val.key2 = i * 2;
});
pending…

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