Preparation code

<script>
  var x = {a: true},
      y = false;
</script>

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return (x.y !== undefined);

return (x.a !== undefined);

return (typeof x.y !== "undefined");

return (typeof x.a !== "undefined");

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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 Jason Mulligan on 6th September 2011
• Revision 2: published on 25th January 2013

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