Preparation code

<script>
  var x;
</script>

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x === undefined

typeof x === 'undefined'

x === void 0

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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 Ron on 4th August 2010
• Revision 2: published on 4th August 2010
• Revision 8: published on 26th April 2011
• Revision 9: published by Anders Ringqvist on 22nd September 2011
• Revision 10: published on 24th September 2011
• Revision 11: published by Anders Ringqvist on 30th October 2011
• Revision 12: published by Anders Ringqvist on 30th October 2011
• Revision 13: published by Anders Ringqvist on 30th October 2011

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