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Generate a GUID/UUID-like string

If you want to generate a string in JavaScript that is compliant with RFC4122, you can use this function:

function guid() {
  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
    var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);
    return v.toString(16);
  });
}

(source)

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