Loops (v91)

Revision 91 of this benchmark created by Jörg Schaper on

Preparation HTML

<script>
var arr = new Array(100);
for (var j = 0, n = arr.length; j < n; j++) {
  arr[j] = Math.random();
}
</script>

Test runner

Ready to run.

Testing in
TestOps/sec
while loop that imitates a for loop
var z = 0;
var i = 0;
while (i < arr.length) {
 z += arr[i++];
};
ready
while loop that imitates a for loop, caching the length
var z = 0;
var i = 0,
    len = arr.length;
while (i < len) {
 z += arr[i++];
};
ready
Reverse while loop
var z = 0;
var i = arr.length;
while (i--) {
 z += arr[i];
};
ready
Reverse while loop without implicit ToBoolean
var z = 0;
var i = arr.length;
while (i-- > 0) {
 z += arr[i];
};
ready
Reverse do … while loop
var z = 0;
var i = arr.length;
do {
 z += arr[i];
} while (i--);
ready
Reverse for loop
var z = 0;
for (var i = arr.length; i--;) {
 z += arr[i];
};
ready
Old ’n’ busted for loop
var z = 0;
for (var i = 0; i < arr.length; ++i) {
 z += arr[i];
};
ready
Old ’n’ busted for loop, caching the length
var z = 0;
for (var i = 0, len = arr.length; i < len; ++i) {
 z += arr[i];
};
ready
Cool guy loop
var z = 0;
for (var i = -1; ++i < arr.length;) {
 z += arr[i];
};
ready
Cool guy loop, caching the length
var z = 0;
for (var i = -1, len = arr.length; ++i < len;) {
 z += arr[i];
};
ready
Native Array#forEach implementation
var z = 0;
arr.forEach(function(x) {
 z += x;
});
ready
Native Array#forEach implementation with named function
var z = 0;
function foo(x) {
 z += x;
};
arr.forEach(foo);
ready
Reverse while loop without implicit ToBoolean (2)
/* Joerg_Schaper@gmx.de 2013/06/16 */
var z = 0;
var i = arr.length;
while (i > 0) {
 z += arr[--i];
};
ready
Reverse while loop without implicit ToBoolean (3)
/* Joerg_Schaper@gmx.de 2013/06/16 */
var z = 0;
var i = arr.length;
while (i > 0) {
 z += arr[i-=1];
};
ready

Revisions

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