Preparation code

<script>
  var iAmNotANumber = 0 / 0;
  var iAmANumber = 1;
  
  var myIsNaN = function(n) {
   return n !== n;
  }
</script>

Test runner

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isNaN(iAmNotANumber);
isNaN(iAmANumber);

iAmNotANumber !== iAmNotANumber;
iAmANumber !== iAmANumber;

myIsNaN(iAmNotANumber);
myIsNaN(iAmANumber);

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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 Florian Cargoët on 30th May 2011
• Revision 2: published on 13th July 2011

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