string concat vs array join

JavaScript performance comparison

Revision 11 of this test case created by

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
Concat
var text = '';

for(var i = 0; i < 4096; i++)
{
    text += String.fromCharCode(i) + String.fromCharCode(i+1);
}


pending…
Join
var a = [];

for(var i = 0; i < 4096; i++)
{
    a.push(String.fromCharCode(i), String.fromCharCode(i+1));
}

var text = a.join('');
pending…
Apply
var a = [];

for(var i = 0; i < 4096; i++)
{
    a.push(i, i+1);
}

var text = String.fromCharCode.apply(null, a);
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.

0 Comments