Loops (v21)

Revision 21 of this benchmark created on

Preparation HTML

<script>
   var getArr = function(){
      var arr = new Array(100);
      arr[14] = 4;
      arr[53] = 8;
      arr[99] = 1;
      return arr;
  }

  var arr = getArr();
</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
for .. in (will skip empty values)
for(i in arr){
 arr[i]
}
ready

Revisions

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