Info

See this discussion in a Codecademy group forum.

I've taken the test code from this comment and modified it only slightly. In particular, I changed <= to < everywhere, because <= involves two comparisons (less than OR equal), which is unnecessary. I also changed the number of repetitions to 10 thousand because JSPerf times each test hundreds of times anyway.

Scroll down to run the tests and a little further down to see charts of previous results for different browsers.

[2013-01-25] update: fixed the bug that caused wrong results. Set the iteration count to 100 thousand.

[2013-01-30] update: fixed infinitive loop bug in the while_minus

Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var i = 0, j = 0, k = 0, max = 100000; // loop variables
    
    var while_loop = function() {
        i = 0;
        while (i < max) {
          i++;
        }
    }
    
    var while_minus = function() {
        while (max>0) {
    max--;
        }
    }
        
    // the loop body is intentionally empty
    var for_loop = function() {
        for (k = 0; k < max; k++) {  }
    }
  };
</script>

Test runner

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

Java applet disabled.

while_loop();

while_minus();

for_loop();

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. Here’s a list of current revisions for this page:

• Revision 1: published by Alex J on 24th January 2013
• Revision 2: published by Alex J on 25th January 2013
• Revision 3: published on 30th January 2013
• Revision 4: published on 30th January 2013
• Revision 5: published by Raul on 31st January 2013

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