Fastest array loops in Javascript

JavaScript performance comparison

Revision 282 of this test case created by

Preparation code

<script>
  // Populate the base array
  var arr = [];
  for (var i = 0; i < 1000; i++) {
    arr[i] = 'value' + i;
  }

  function someFn(ix) {
   var  i =  ix * 5 + 1 / 3 * 8;
    m +=i;
return i;
  }
</script>
      
<script>
Benchmark.prototype.setup = function() {
   m = 0;

};

Benchmark.prototype.teardown = function() {
  console.log(m);

};
</script>

Test runner

Warning! For accurate results, please disable Firebug before running the tests. (Why?)

Java applet disabled.

Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
For loop
var i;
for (i = arr.length; i > 0; i--) {
  someFn(i);
}
pending…
forEach function
arr.forEach(function(d, i) {
  someFn(i);
});
pending…
Removing Element while loop
var ar = arr;
var l = ar.length;
while (ar.length) {

  someFn(10);
  ar.shift();
}
pending…
For loop, basic
for (var i = 0; i < arr.length; i++) {
  someFn(i);
}
pending…
For loop, i -= 1
for (var i = arr.length; i > 0; i -= 1) {
  someFn(i);
}
pending…
while loop i--
var i = arr.length;
while (i--) {
  someFn(i);
}
pending…

Compare results of other browsers

Revisions

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

0 Comments