UUID Generator huh.

const a = () => {
    let a = '';
    for (let i = 0; i < 32; i += 1) {
        if ([8, 12, 16, 20].includes(i)) {
            a += '-';
        }
        let n;
        if (i == 12) {
            n = 4;
        } else {
            const d = Math.random() * 16 | 0;
            if (i == 16) {
                n = (d & 3) | 0;
            } else {
                n = d;
            }
        }
        a += n.toString(16);
    }
    return a;
}