Javascript function to generate a guid

As seen at HotGuids

function S4() {
   return (((1+Math.random())*0x10000)|0).toString(16).substring(1);
}
function guid() {
   return (S4()+S4()+"-"+S4()+"-"+S4()+"-"+S4()+"-"+S4()+S4()+S4());
}

Or as a one liner....

function guid() {
   return ((((1+Math.random())*0x10000)|0).toString(16).substring(1)+(((1+Math.random())*0x10000)|0).toString(16).substring(1)+"-"+(((1+Math.random())*0x10000)|0).toString(16).substring(1)+"-"+(((1+Math.random())*0x10000)|0).toString(16).substring(1)+"-"+(((1+Math.random())*0x10000)|0).toString(16).substring(1)+"-"+(((1+Math.random())*0x10000)|0).toString(16).substring(1)+(((1+Math.random())*0x10000)|0).toString(16).substring(1)+(((1+Math.random())*0x10000)|0).toString(16).substring(1));
}

Or as a NimbleText snippet....

<% ((((1+Math.random())*0x10000)|0).toString(16).substring(1)+(((1+Math.random())*0x10000)|0).toString(16).substring(1)+"-"+(((1+Math.random())*0x10000)|0).toString(16).substring(1)+"-"+(((1+Math.random())*0x10000)|0).toString(16).substring(1)+"-"+(((1+Math.random())*0x10000)|0).toString(16).substring(1)+"-"+(((1+Math.random())*0x10000)|0).toString(16).substring(1)+(((1+Math.random())*0x10000)|0).toString(16).substring(1)+(((1+Math.random())*0x10000)|0).toString(16).substring(1)) %>

(TODO: Embed a newGuid() function in NimbleText)

....ah, that's "guid-like" but it's not really a guid.

Here's a better one:

function uuidv4() {
  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);
  });
}

Puts a 4 and a "(r & 0x3 | 0x8)" right where guid type 4 expects it.

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