从此switch语句中执行`return'';`或`return null;`更有意义吗？

Question

对于以下功能，从return ''子句中对return null或default有意义吗？

const getComputerChoice = () => {
  const randomNumber = Math.floor( Math.random() * 3 );

  let computerChoice;
  switch (randomNumber) {
    case 0:
      computerChoice = 'rock';
      break;
    case 1:
      computerChoice = 'paper';
      break;
    case 2:
      computerChoice = 'scissors';
      break;
    default:
      computerChoice = '';
  }

  return computerChoice; 
}    

或

const getComputerChoice = () => {
  const randomNumber = Math.floor( Math.random() * 3 );

  let computerChoice;
  switch (randomNumber) {
    case 0:
      computerChoice = 'rock';
      break;
    case 1:
      computerChoice = 'paper';
      break;
    case 2:
      computerChoice = 'scissors';
      break;
    default:
      computerChoice = null;
  }

  return computerChoice; 
}    

而且，即使在break子句中也包含default，这也是一个好习惯吗？

Answer 1

什么时候需要返回三个之中之一以外的任何东西？

如果JS引擎突然在数学运算中发现错误，则可能会引发错误。否则，只需使用始终为0、1或2的随机数来索引3个选择的数组。注意，没有括号时，无需显式的return语句

const getComputerChoice = () => ["rock", "paper", "scissors"][Math.floor(Math.random() * 3)];

console.log(getComputerChoice());
console.log(getComputerChoice());
console.log(getComputerChoice());
console.log(getComputerChoice());
console.log(getComputerChoice());
console.log(getComputerChoice());
console.log(getComputerChoice());
console.log(getComputerChoice());
console.log(getComputerChoice());
console.log(getComputerChoice());