caching length (v38)

Revision 38 of this benchmark created by Mitranim on

Setup

var arr = [];
    for (var i = 0; i < 1000; i++) {
      arr[i] = Math.random();
    }

Test runner

Ready to run.

Testing in
TestOps/sec
for cached
for (var i = 0, ii = arr.length; i < ii; ++i) {
  arr[i] *= 2;
}
ready
for uncached
for (var i = 0; i < arr.length; ++i) {
  arr[i] *= 2;
}
ready
while cached
var i = -1, ii = arr.length;
while (++i < ii) {
  arr[i] *= 2;
}
ready
while uncached
var i = -1;
while (++i < arr.length) {
  arr[i] *= 2;
}
ready
while cached reverse
var i = arr.length;
while (--i >= 0) {
  arr[i] *= 2;
}
ready
do-while cached
var i = 0, ii = arr.length;
do {
  arr[i] *= 2;
} while (++i < ii);
ready
do-while uncached
var i = 0;
do {
  arr[i] *= 2;
} while (++i < arr.length);
ready
Array forEach
arr.forEach(function(value, i) {
  arr[i] = value * 2;
});
ready
for..in
for (var i in arr) {
  arr[i] *= 2;
}
ready
for with function
for (var i = 0, ii = arr.length; i < ii; ++i) {
  step(i);
}
function step(i) {
  arr[i] *= 2;
}
ready

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.