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var stuff = 1;

if (stuff === undefined) {
  stuff += stuff; // never reached
}

var stuff = 1, undefined;

if (stuff === undefined) {
  stuff += stuff; // never reached
}

var stuff = 1;

if (stuff === void 0) {
  stuff += stuff; // never reached
}

var stuff = 1;

if (typeof stuff === "undefined") {
  stuff += stuff; // never reached
}

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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 on 15th December 2012
• Revision 2: published by @blixt on 15th December 2012
• Revision 3: published on 18th March 2013

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