Info

This is comparing the runtimes of substr, substring, and slice in a string for large (10000 character) string size.

Preparation code

<script type="text/javascript">
  var longString = "";
  // Large = 10,000
  for (var i = 0; i < 10000; i++) {
        longString += i % 10;
  }
</script>

Test runner

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

Java applet disabled.

for (i = 0; i < longString.length; i++) {
  longString.substring(i, i + 1);
}

for (i = 0; i < longString.length; i++) {
  longString.slice(i, i + 1);
}

for (i = 0; i < longString.length; i++) {
  longString.substr(i, 1);
}

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:

• Revision 1: published by Kon P on 26th January 2012 and last updated 2 weeks ago
• Revision 2: published on 26th January 2012
• Revision 3: published on 18th February 2012
• Revision 4: published on 27th March 2012
• Revision 5: published on 27th March 2012
• Revision 6: published by klaus lynggard hougesen on 2nd May 2012
• Revision 7: published by Aaron Patterson on 14th May 2012
• Revision 8: published on 31st July 2012
• Revision 11: published on 29th November 2012
• Revision 12: published on 15th January 2013
• Revision 13: published on 13th February 2013
• Revision 14: published 5 days ago

1 comment