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じゃんけん

Last updated at Posted at 2021-04-02
const GU = 1
const CHOKI = 2
const PA = 3

hand = prompt('コンピュータとじゃんけんをします。半角数字を選んでください。\n\n' + '1: グー\n' + '2: チョキ\n' + '3: パー\n')
hand = parseInt(hand, 10) //数値化



com = Math.floor(Math.random() * 3) + 1 //1.2.3

let result = '';
let comHandName = '';

switch (com) {
  case GU:
    comHandName = 'グー'
    break;

  case CHOKI:
    comHandName = 'チョキ'
    break;

  case PA:
    comHandName = 'パー'
    break;
}

if (hand === com) {
  result = 'あいこです。'
}

else if ((hand == 1 && com == 2) || (hand == 2 && com == 3) || (hand == 3 && com == 1)) {
  result = 'あなたの勝ちです。'
}

else {
  result = 'あなたの負けです。'
}


alert(result + 'コンピューターは「' + comHandName + '」を出しました。')

エラーパターンを除いた場合は、例えば4を入れるとif文のどれにも当てはまらないので負けが返ってくる。
とても勉強になりました。

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