UUID (Universally Unique Identifier) Generator. Method lets you get cryptographically strong random values

strong-uuid.js

// Description: fast and strong UUID generator for JavaScript
// Author: https://github.com/m-2k
// License: MIT

let uuid = () => Array.from(window.crypto.getRandomValues(new Uint8Array(16))).reduce((acc, byte, idx) => {
    switch(idx) {
        case 6: acc += "-4"; break
        case 8: acc += "-" + ((byte & 0xF) & 0x3 | 0x8).toString(16); break
        case 10: case 4: acc += "-"
        default: acc += (byte & 0xF).toString(16)
    }
    return acc + (byte >>> 4).toString(16) }, '' )