Loops (v241)

Revision 241 of this benchmark created on

Preparation HTML

<script>
  var arr = new Array(100);
</script>

Test runner

Ready to run.

Testing in
TestOps/sec
while loop that imitates a for loop
var i = 0;
while (i < arr.length) {
 arr[i];
 i++;
};
ready
while loop that imitates a for loop, caching the length
var i = 0,
    len = arr.length;
while (i < len) {
 arr[i];
 i++;
};
ready
Reverse while loop
var i = arr.length;
while (i--) {
 arr[i];
};
ready
Reverse while loop without implicit ToBoolean
var i = arr.length;
while (i-- > 0) {
 arr[i];
};
ready
Reverse do … while loop
var i = arr.length;
do {
 arr[i];
} while (i--);
ready
Reverse for loop
for (var i = arr.length; i--;) {
 arr[i];
};
ready
Old ’n’ busted for loop
for (var i = 0; i < arr.length; ++i) {
 arr[i];
};
ready
Old ’n’ busted for loop, caching the length
for (var i = 0, len = arr.length; i < len; ++i) {
 arr[i];
};
ready
Cool guy loop
for (var i = -1; ++i < arr.length;) {
 arr[i];
};
ready
Cool guy loop, caching the length
for (var i = -1, len = arr.length; ++i < len;) {
 arr[i];
};
ready
Native Array#forEach implementation
arr.forEach(function(x) {
 x;
});
ready
Native Array#forEach implementation with named function
function foo(x) {
 x;
};
arr.forEach(foo);
ready
Loop case 1
var i;
for (i = 0; i < arr.length; i += 1) {
    arr[i];
}
ready
Loop case 2
var i, l;
for (i = 0, l = arr.length; i < l; i += 1) {
    arr[i];
}
ready
Reverse 'for' loop (using pre-decrement)
for (var i = arr.length; !!~--i ;) {
 arr[i];
};
ready
Loop rolling
var i = 0, len = arr.length;
for (; (i+3) < len; i+=4) {
  arr[i];
  arr[i + 1];
  arr[i + 2];
  arr[i + 3];
}
for (; i < len; i++) {
  arr[i];
}
ready
reverse loop rolling
var i = arr.length;
for (; !(((i-=4)&(1<<31)) | !i); ) {
  arr[i - 3];
  arr[i - 2];
  arr[i - 1];
  arr[i];
}
for (i+=4; !!~--i ;) {
  arr[i];
}
ready
Forward loop
for (var i = 0; i < arr.length; i++) {
 arr[i];
};
ready

Revisions

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