Info

Merge creates a smaller footprint because it loops through the original array and adds the new items. Concat is a built-in Javascript function and should be faster, but has a larger footprint.

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script>
  //unmodified array
  var baseArray = ["Napoleon"];
  
  //modified arrays
  var catArray = [],
      merArray = [];
  
  //cache concat prototype for best performance
  var concat = Array.prototype.concat;
</script>

Preparation code output

Test runner

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

Java applet disabled.

catArray = concat.call(catArray, baseArray);

$.merge(merArray, baseArray);

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 Jeremy Mullinax-Hill on 27th April 2011
• Revision 2: published on 25th May 2011
• Revision 3: published on 1st June 2011
• Revision 4: published by Xav on 24th January 2013
• Revision 5: published by leeroy on 25th January 2013

0 comments