for vs forEach

JavaScript performance comparison

Revision 79 of this test case created by and last updated

Preparation code

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js">
</script>
      
<script>
Benchmark.prototype.setup = function() {
  var i,
    value,
    length,
    values = [],
    sum = 0,
    context = values;
  
  
  for (i = 0; i < 10000; i++) {
    values[i] = Math.random();
  }
  
  function add(val) {
    sum += val;
  }

};

Benchmark.prototype.teardown = function() {
  i = 0;
  value = 0;
  length = 0;
  values = [];
  sum = 0;

};
</script>

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
forEach closure
values.forEach(function(val) {
  sum += val;
});
pending…
$.each
$.each(values, function(key, value) {
  sum += value;
});
pending…
for ... in
for (i in values) {
  sum += values[i];
}
pending…
forEach
values.forEach(add);
pending…

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Revisions

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