for vs while loop

JavaScript performance comparison

Revision 4 of this test case created

Preparation code

<script>
  var foo = [1, 2, 3, 4, 5];
  var sum = 0;
</script>

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Testing in unknown unknown
Test Ops/sec
for
var l = foo.length;
for (var i = 0; i < l; i++) {
 sum += foo[i];
}
pending…
while
var i = foo.length;
while (i--) {
 sum += foo[i];
}
pending…
for backwards
var l = foo.length;
for (var i = l; i--;) {
 sum += foo[i];
}
pending…
forEach
foo.forEach(function(e) {
   sum += e;
});
pending…
forEach
foo.forEach(function(e) {
   sum += e;
});
pending…

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