Trim String

JavaScript performance comparison

Revision 3 of this test case created by Marshall Cline

Info

3 styles of RegExp: with unnecessary capture groups (was in there previously), without capture groups, and pre-created / cached.

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var text = '    jsperf    ';
    var leadTrailWs = /^\s+|\s+$/g;
   
};
</script>

Test runner

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

Java applet disabled.

Testing in unknown unknown
Test Ops/sec
RegExp with unnecessary capture groups
text = text.replace(/(^\s+)|(\s+$)/g, '')
pending…
String.prototype.trim
text = text.trim()
pending…
RegExp without capture groups
text = text.replace(/^\s+|\s+$/g, '')
pending…
Cached RegExp
text = text.replace(leadTrailWs, '')
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