JavaScript create UUID

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

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Awgiedawgie 440220 points

                                    function uuid() {<br/>  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {<br/>    var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r &amp; 0x3 | 0x8);<br/>    return v.toString(16);<br/>  });<br/>}<br/><br/>var userID=uuid();//something like: &quot;ec0c22fa-f909-48da-92cb-db17ecdb91c5&quot;

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Awgiedawgie 440220 points

                                    function uuidv4() {
  return ([1e7]+-1e3+-4e3+-8e3+-1e11).replace(/[018]/g, c =&gt;
    (c ^ crypto.getRandomValues(new Uint8Array(1))[0] &amp; 15 &gt;&gt; c / 4).toString(16)
  );
}

console.log(uuidv4());

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