awesome-im/src/utils/util.js

Lightweight, extensible, JavaScript Instant Messaging.

export const guid = () => {
    return 'xxxx-xxxx-xxxx-xxxx'.replace(/[xy]/g, function (c) {
        const r = Math.random() * 16 | 0,
            v = c == 'x' ? r : (r & 0x3 | 0x8);
        return v.toString(16).toUpperCase();
    });
}

export const uuid = () => {
    const s = [];
    const hexDigits = "0123456789abcdef";
    for (let i = 0; i < 36; i++) {
        s[i] = hexDigits.substr(Math.floor(Math.random() * 0x10), 1);
    }
    s[14] = "4"; // bits 12-15 of the time_hi_and_version field to 0010
    s[19] = hexDigits.substr((s[19] & 0x3) | 0x8, 1); // bits 6-7 of the clock_seq_hi_and_reserved to 01
    s[8] = s[13] = s[18] = s[23] = "-";

    const uuid = s.join("");
    return uuid;
}