For vs While (v16)

Revision 16 of this benchmark created by Shane Grüling on

Preparation HTML

<script>
  var i, values = [],
      sum = 0;

/* I think 1000 is a more realistic value than 10000.
  */

  for (i = 0; i < 1000; i++) {
    values[i] = i;
  }


/* if the sum is bigger than 1000 it will be set to 0
  ** ´cause the value should not be bigger on on the beginning
  ** of a test as at the beginning of another test before.
  */

  function add(val) {
    sum == 1000 ? (sum = 0) : (sum += val);
  }
</script>

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, simple (with var)
for (var 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 loop, reverse (not equal, with var)
for (var i = values.length - 1; i != 0; i--) {
  add(values[i]);
}
ready
for loop, cached length, no callback
var len = values.length;
for (i = 0; i < len; i++) {
  sum += values[i];
}
ready
for loop, cached length, no callback (one time „var”, [using var], not equal [len-1] instead of less
var len = values.length - 1,
    i = 0;
for (; i != len;) {
  sum += values[i++];
}
ready
for loop, cached length, using function.call and supplying index and original array
var len = values.length;
for (i = 0; i < len; i++) {
  add.call(values, values[i], i, values);
}
ready
While, reversed + simple
var i = values.length;
while (--i >= 0) {
  sum += values[i];
}
ready
While, reversed + simple, leftside --, not linked
var i = values.length + 0;
while (i-- != -1) {
  sum += values[i];
}
ready
While, reversed + callback
var i = values.length;
while (--i >= 0) {
  add.call(values, values[i], i, values);
}
ready
While, reversed + callback, -- right side
var i = values.length;
while (i-- >= 0) {
  add.call(values, values[i], i, values);
}
ready
While
var l = values.length;
var i = 0;
while (i++ <= l) {
  sum += values[i];
}
ready
While, one-time var, not equal
var l = values.length - 1,
    i = 0;

while (i++ != l) {
  sum += values[i];
}
ready
For - prefix decrement, gt0
for (var i = values.length; i >= 0; --i) {
  sum += values[i];
}
ready
For - prefix decrement, not equal
for (var i = values.length - 1; i != 0; --i) {
  sum += values[i];
}
ready
For - prefix decrement, gt
for (var i = values.length; --i >= 0;) {
  sum += values[i];
}
ready
For - prefix uq -1
for (var i = values.length; --i != -1;) {
  sum += values[i];
}
ready
For - gt -1
for (var i = values.length; i > -1; --i) {
  sum += values[i];
}
ready
For with assignment
for (var i = 0; match = values[i]; ++i) {
  sum += match;
}
ready

Revisions

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