How to use random

const create16Uiid = () => {
 let result = '';
 for (let i = 0; i < 16; i += 1) {
  result += random.int(0, 9);
 }
 return result;
}

function isReplaceNeeded(originalBlockchain, newBlockchain) {
  /**
   * TODO: the haviest chain rule.
   * The current implementation is the longest chain rule.
   */
  if (originalBlockchain.length < newBlockchain.length) { return true; }
  else if (originalBlockchain.length > newBlockchain.length) { return false; }
  else { return boolean(); }
}