uuid

const uuid = (n = 6) => {
  if (n < 2) {
    throw new RangeError('n is not less than 2');
  }
  const CHARS = 'abcdefghigklmnopqrstuvwxyz';
  const NUMS = '0123456789';
  const ALL = CHARS + NUMS;
  let repeatStr = '';
  for (let i = 0; i < n - 2; i++) {
    repeatStr += 'z';
  }
  return `xx${repeatStr}`.replace(/[xz]/g, (c) =>
    c === 'x' ? CHARS[(Math.random() * 26) | 0] : ALL[(Math.random() * 36) | 0],
  );
};