JavaScript: Function to create a UUID identifier

JavaScript Math: Exercise-23 with Solution

Write a JavaScript function to create a UUID identifier.

Note :
According to Wikipedia - A universally unique identifier (UUID) is an identifier standard used in software construction. A UUID is simply a 128-bit value. The meaning of each bit is defined by any of several variants. For human-readable display, many systems use a canonical format using hexadecimal text with inserted hyphen characters. For example : de305d54-75b4-431b-adb2-eb6b9e546014

Sample Solution:-

HTML Code:

<!DOCTYPE html>
  <meta charset="utf-8">
  <title>Write a JavaScript function to create a UUID</title>


JavaScript Code:

function create_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;


Sample Output:



Flowchart: JavaScript Math- Function to create a UUID identifier

Live Demo:

See the Pen javascript-math-exercise-23 by w3resource (@w3resource) on CodePen.

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JavaScript: Tips of the Day

Spread operator

const user = { name: 'Owen', age: 21 };
const admin = { admin: true, ...user };


It's possible to combine objects using the spread operator .... It lets you create copies of the key/value pairs of one object, and add them to another object. In this case, we create copies of the user object, and add them to the admin object. The admin object now contains the copied key/value pairs, which results in { admin: true, name: "Owen", age: 21 }.

Ref: https://bit.ly/323Y0P6