module.exports = {
  uuidv4() {
    const uuid = new Array(36);
    for (let i = 0; i < 36; i++) {
      uuid[i] = Math.floor(Math.random() * 16)
    }
    uuid[14] = 4;
    uuid[19] = uuid[19] &= ~(1 << 2);
    uuid[19] = uuid[19] |= (1 << 3);
    uuid[8] = uuid[13] = uuid[18] = uuid[23] = '-';
    return uuid.map(x => x.toString(16)).join('')
  }
}