string concat vs array join

JavaScript performance comparison

Revision 26 of this test case created by Ger Hobbelt

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 = '';

var words = ['this', 'is', 'a', 'test'];

text = words[0];

for(var i = 1; i < 10000; ++i)
{
    text += ' ' + words[i & 3];
}


pending…
Join: length
var a = [];

var words = ['this', 'is', 'a', 'test'];

for(var i = 0; i < 10000; ++i)
{
    a[a.length] = words[i & 3];
}

var text = a.join(' ');
pending…
Join 2: index
var a = [];

var words = [1, 2, 3, 4];

for(var i = 0; i < 10000; ++i)
{
    a[i] = words[i & 3];
}

var text = a.join(' ');
pending…
Join 3: push
var a = [];

var words = [1, 2, 3, 4];

for(var i = 0; i < 10000; ++i)
{
    a.push(words[i & 3]);
}

var text = a.join(' ');
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