Browser Diet - Cache Array Length

JavaScript performance comparison

Revision 25 of this test case created by aaa

Preparation code

  var arr = new Array(10000000),
      len, i;

Test runner

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

Java applet disabled.

Testing in unknown unknown
Test Ops/sec
Without cache
for (i = 0; i < arr.length; i++) {
  // do something
With cache
for (i = 0, len = arr.length; i < len; i++) {
  // do something
Real with cache
len = arr.length;
for (i = 0; i < len; i++) {
  // do something

Compare results of other browsers


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:


Add a comment