for vs forEach

JavaScript performance comparison

Revision 135 of this test case created by

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
values.forEach(add);
pending…
for loop, simple
for (i = 0; i < values.length; i++) {
  sum += values[i];
}
pending…
for loop, cached length
for (i = 0; i < values.length; i += 1) {
  sum += values[i];
}
pending…
for loop, reverse
pending…
for loop, cached length, callback
pending…
for loop, cached length, callback.call
pending…
$.each
$.each(values, function(index, value) {
  sum += value;
});
pending…
for ... in
for (key in values) {
  sum += values[key];
}
pending…
for loop, reverse, decrement condition
pending…
for loop, reverse, pre-decrement
pending…
for loop, assignment condition
pending…
for loop, assignment condition, reversed
pending…
for loop, assignment condition, callback
pending…
for loop, assignment condition, callback.call
pending…

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