Loops (v232)

Revision 232 of this benchmark created on

Setup

var arr = new Array(100);

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
Reversed BOOLEAN check
for (var i = (arr.length - 1); i != -1; i--) {
  arr[i];
};
ready
Loop unrolling
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

Revisions

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