w3resource

JavaScript: Generate a UUID in a browser

JavaScript fundamental (ES6 Syntax): Exercise-253 with Solution

Write a JavaScript program to generate a UUID in a browser.

  • Use Crypto.getRandomValues() to generate a UUID, compliant with RFC4122 version 4.
  • Use Number.prototype.toString(16) to convert it to a proper UUID.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
const UUIDGeneratorBrowser = () =>
  ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c =>
    (c ^ (crypto.getRandomValues(new Uint8Array(1))[0] & (15 >> (c / 4)))).toString(16)
  );
console.log(UUIDGeneratorBrowser());

Sample Output:

a47704c1-b9cb-481d-bada-bd6495a88ef7

Flowchart:

flowchart: Generate a UUID in a browser.

Live Demo:

See the Pen javascript-basic-exercise-253-1 by w3resource (@w3resource) on CodePen.


Improve this sample solution and post your code through Disqus

Previous: Write a JavaScript program to convert the values of RGB components to a color code.
Next: Write a JavaScript program to generate a UUID in Node.JS. Use crypto API to generate a UUID, compliant with RFC4122 version 4.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



Follow us on Facebook and Twitter for latest update.

JavaScript: Tips of the Day

Creates a function that accepts up to n arguments, ignoring any additional arguments

Example:

const ary = (fn, n) => (...args) => fn(...args.slice(0, n));
const tips_firstTwoMax = ary(Math.max, 2);
console.log([[3, 5, 'p'], [4, 8, 12], [15]].map(x => tips_firstTwoMax(...x)));

Output:

[5,8,15]

 

We are closing our Disqus commenting system for some maintenanace issues. You may write to us at reach[at]yahoo[dot]com or visit us at Facebook