UUIDv4

uuidv4.ts

/**
 * Generate a random UUIDv4 (rfc4122 compliant)
 */
export function uuid(): string {
    const uuid = [8, 4, 4, 4, 12].map((segmentLength: number) => {
        let segment = Array(segmentLength);

        for (let i = 0; i < segmentLength; i++)
            // ToUint32 http://www.ecma-international.org/ecma-262/5.1/#sec-11.7.3
            segment[i] = (Math.random() * 0xf) >>> 0;

        return segment;
    });

    uuid[2][0] &= 0x3;
    uuid[2][1] |= 0x8;
    uuid[3][0] = 0x4;

    return uuid
        .map((segment: number[]) => segment.map(n => n.toString(16)).join(''))
        .join('-');
}