Editing JavaScript Loops This edit will create a new revision. Your details (optional) Name Email (won’t be displayed; might be used for Gravatar) URL Test case details Title * Published (uncheck if you want to fiddle around before making the page public) Description (in case you feel further explanation is needed)(Markdown syntax is allowed) See [this discussion](http://www.codecademy.com/groups/advanced-javascript-coders/discussions/50fb09eef68780dcf30006ec) in a Codecademy group forum. I've taken the test code from [this comment](http://j.mp/WQ9HNY) 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](#runner) and a little further down to see charts of previous results for [different browsers](#bs-results). [2013-01-25] **update**: fixed the bug that caused wrong results. Set the iteration count to 100 thousand. Are you a spammer? (just answer the question) Preparation code Preparation code HTML (this will be inserted in the <body> of a valid HTML5 document in standards mode) (useful when testing DOM operations or including libraries) Include JavaScript libraries as follows: <script src="//cdn.ext/library.js"></script> Define setup for all tests (variables, functions, arrays or other objects that will be used in the tests) (runs before each clocked test loop, outside of the timed code region) (e.g. define local test variables, reset global variables, clear canvas, etc.) (see FAQ) var i = 0, j = 0, k = 0, max = 100000; // loop variables var while_loop = function() { i = 0; while (i < max) { i++; } } var while_and_break = function() { j = 0; while (true) { j++; if (j > max) { break; } } } // the loop body is intentionally empty var for_loop = function() { for (k = 0; k < max; k++) { } } Define teardown for all tests (runs after each clocked test loop, outside of the timed code region) (see FAQ) Code snippets to compare Test 1 Title Async (check if this is an asynchronous test) Code while_loop(); Test 2 Title Async (check if this is an asynchronous test) Code while_and_break(); Test 3 Title Async (check if this is an asynchronous test) Code for_loop();