for vs forEach vs while (v64)

Revision 64 of this benchmark created on

Description

Is it faster to use the native forEach or just loop with for?

Setup

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;
      }

Test runner

Ready to run.

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

Revisions

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