![]() ![]() Algorithms for Creating a UUID from Truly Random or Pseudo-Random Numbers: /getrfc.php?rfc=4122 – Jason DeFontes Sep 19 '08 at 20:28Ĭould someone explain this code to me? It looks like the S4 function tries to get a random hex number between 0x10000 and 0x20000, then outputs the last 4 digits. You just have to twiddle a couple of bits to identify it as such. Do not use this answer if you need compliant GUIDs.Īctually, the RFC allows for UUIDs that are created from random numbers. Note: the provided code snippet does not follow RFC4122 which requires that the version (4) has to be integrated into the generated output string. You'll need to use OS-specific services like ActiveX: Įdit: not correct - RFC4122 allows random ("version 4") GUIDs. There's no way to generate real GUIDs in Javascript, because they depend on properties of the local computer that browsers do not expose. However, note that such values are not genuine GUIDs. The question is: do you want actual GUIDs, or just random numbers that look like GUIDs? It's easy enough to generate random numbers. There have been a couple attempts at this. ![]() GUIDs when repesented as as strings are at least 36 and no more than 38 characters in length and match the pattern ^\$ – noonand Feb 13 '17 at 11:40 ![]() The GUID / UUID should be at least 32 characters and should stay in the ASCII range to avoid trouble when passing them around. I'm not sure what routines are available on all browsers, how "random" and seeded the built-in random number generator is, etc. I'm trying to create globally-unique identifiers in JavaScript. ![]()
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