Preparation code

<script>
  a = {
   b: true
  };
</script>

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if (a["b"]) {
}

if (a.hasOwnProperty("b")) {
}

if (Object.prototype.hasOwnProperty.call(a, "b")) {}

if ("b" in a) {}

if (a.b) {}

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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 Tom Robinson on 4th April 2011
• Revision 2: published on 2nd January 2012
• Revision 3: published on 3rd January 2012

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