Generate UUID in JavaScript

uuid.js

/*
UUIDs (Universally Unique IDentifier), also known as GUIDs (Globally Unique IDentifier), according to RFC 4122, are identifiers designed to provide certain uniqueness guarantees.

While it is possible to implement RFC-compliant UUIDs in a few lines of JavaScript code (e.g., see @broofa's answer, below) there are several common pitfalls:

    Invalid id format (UUIDs must be of the form "xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx", where x is one of [0-9, a-f] M is one of [1-5], and N is [8, 9, a, or b]
    Use of a low-quality source of randomness (such as Math.random)

Thus, developers writing code for production environments are encouraged to use a rigorous, well-maintained implementation such as the uuid module.

https://stackoverflow.com/questions/105034/how-to-create-a-guid-uuid/2117523#2117523
*/

// 36 characters
// xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx   
/*
 * x 0
 * x 1
 * x 2
 * x 3
 * x 4
 * x 5
 * x 6
 * x 7
 * - 8
 * x 9
 * x 10
 * x 11
 * x 12
 * - 13
 * M 14
 * x 15
 * x 16
 * x 17
 * - 18
 * N 19
 * x 20
 * x 21
 * x 22
 * - 23
 * x 24
 * x 25
 * x 26
 * x 27
 * x 28
 * x 29
 * x 30
 * x 31
 * x 32
 * x 33
 * x 34
 * x 35
 */        
function generateUUID() {
    const x = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 'a', 'b', 'c', 'd', 'e', 'f'];
    const m = [1, 2, 3, 4, 5];
    const n = [8, 9, 'a', 'b'];
    let uuid = "";
    for (var i = 0; i < 36; i++) {
        if (i >= 0 && i <= 7) {
            // x
            uuid += getRandomElementFromArray(x);
        } else if (i === 8 || i === 13 || i === 18 || i === 23) {
            // dash
            uuid += '-';
        } else if (i >= 9 && i <= 12) {
            // x
            uuid += getRandomElementFromArray(x);
        } else if (i >= 14 && i <= 17) {
            // x
            uuid += getRandomElementFromArray(x);
        } else if (i === 19) {
            // N
            uuid += getRandomElementFromArray(n);
        } else if (i >= 20 && i <= 22) {
            // x
            uuid += getRandomElementFromArray(x);
        } else if (i >= 24 && i <= 35) {
            // x
            uuid += getRandomElementFromArray(x);
        }
    }
    return uuid;
}

// https://stackoverflow.com/questions/4550505/getting-a-random-value-from-a-javascript-array
function getRandomElementFromArray(array) {
    return array[Math.floor(Math.random() * array.length)];
}

const newUUID = generateUUID();
console.log(`newUUID: ${newUUID}`);