in vs hasOwnProperty vs propdef

JavaScript performance comparison

Revision 6 of this test case created

Info

Tests which is faster.

Preparation code

<script>
  var attrFn = {
   name: true,
   val: true,
   css: true,
   html: true,
   text: true,
   data: true,
   width: true,
   height: true,
   offset: true
  };
  var name = "data";
  var none = "unknown";
  var res;
</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
in test
if( none in attrFn ){
    res = 1;
}
pending…
prop ok
if( attrFn[none] ){
    res = 1;
}
pending…
hasOwnProp
if( attrFn.hasOwnProperty(none) ){
    res = 1;
}
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