Array Assignment vs Array Push

JavaScript performance comparison

Revision 2 of this test case created by mrgnou

Info

You've heard the rumors - now here's the proof.

Test runner

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

Java applet disabled.

Testing in unknown unknown
Test Ops/sec
arrayA[arrayA.length] = 'foo';
var arrayA = [];
for (var i = 0; i < 2000; i++) {
  arrayA[arrayA.length] = 'foo';
}
pending…
arrayB.push('foo');
var arrayB = [];
for (var i = 0; i < 2000; i++) {
  arrayB.push('foo');
}
pending…
arrayC[i] = 'foo';
var arrayC = [];
for (var i = 0; i < 2000; i++) {
  arrayC[i] = 'foo';
}
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. Here’s a list of current revisions for this page:

0 comments

Add a comment