Boo who

我写的

function booWho(bool) {
  if (bool === false || bool === true) {
    return true
  } else {
    return false
  }
}

console.log(booWho(1))

还可以这样写：

function booWho(bool) {
  return typeof bool === 'boolean'
}

console.log(booWho(1))

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