Debunk method calls in loop conditions

JavaScript performance comparison

Test case created by Raymond

Preparation code

Benchmark.prototype.setup = function() {
  var my_array = [0,1,2,3,4,5,6,7,8,9];
  function myMethod() {
      return my_array.length;


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(var i = 0; i < my_array.length; i++){};
for(var i = 0; i < myMethod(); i++){};
var length = my_array.length;
for(var i = 0; i < length; i++){};
var length = myMethod();
for(var i = 0; i < length; i++){};

Compare results of other browsers


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

1 Comment