const CHARS = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.split('');

export function uuid() {
    // return `ID${globalId++}`;
    const uuid = new Array(36);

    let rnd = 0,
        r;
    for (let i = 0; i < 36; i++) {
        if (i === 8 || i === 13 || i === 18 || i === 23) {
            uuid[i] = '-';
        } else if (i === 14) {
            uuid[i] = '4';
        } else {
            if (rnd <= 0x02) rnd = 0x2000000 + (Math.random() * 0x1000000) | 0;
            r = rnd & 0xf;
            rnd = rnd >> 4;
            uuid[i] = CHARS[(i === 19) ? (r & 0x3) | 0x8 : r];
        }
    }
    return uuid.join('');
}