for vs forEach vs while

JavaScript performance comparison

Revision 64 of this test case created by

Preparation code


      
      <script>
Benchmark.prototype.setup = function() {
    var i, values = [],
        sum = 0;
    for (i = 0; i < 10000; i++) {
      values[i] = i;
    }
  
    function add(val) {
      sum += val;
      var x = {};
      x.funct = function(vax) { return vax * 223; }
      x.v = 2329 * x.funct(val);
      sum += x.v;
    }

};
</script>

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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++) {
  add(values[i]);
}
pending…
for loop, cached length
var len = values.length;
for (i = 0; i < len; i++) {
  add(values[i]);
}
pending…
for loop, reverse
for (i = values.length - 1; i >= 0; i--) {
  add(values[i]);
}
pending…
for in loop
for (var i in values) {
  add(values[i]);
}
pending…
for loop, equality comparison
for (i = 0; i !== values.length; i++) {
  add(values[i]);
}
pending…
for loop, equality comparison, cached length
var len = values.length;
for (i = 0; i !== len; i++) {
  add(values[i]);
}
pending…
while loop, reversed
var len = values.length;
while (len) {
  add(values[--len]);
}
pending…
while loop, reversed, ordered
// if order matters
var len, i;
len = i = values.length;
while (i) {
  add(values[len - (i--)]);
}
console.log("test vecchio");
pending…

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Revisions

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