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【JavaScript 関数ドリル】中級編のreverse関数の実装アウトプット

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reverse関数の課題内容

_.reverse関数を自分で実装する課題。
https://lodash.com/docs/4.17.15#reverse

「課題内容」/「解説動画」/「解答例」を確認したい場合は、以下リンク先のページを参照。
https://js-drills.com/blog/reverse/

課題に取り組む前の状態

  • 解答を見なくてもできそうだと思った。

課題に取り組んだ後の状態

  • 自分で実装できた。
  • 解答例はループ処理の回数が半分で済む記述となっていて、参考になった。

reverse関数の実装コード(答えを見る前)

function reverse(array) {
    const reversedArray = [];

    for (let i = 0; i < array.length; i++) {
        reversedArray.unshift(array[i]);
    }
    for (let i = 0; i < array.length; i++) { 
        array[i] = reversedArray[i];
    }
    return array;
}

var array = [1, 2, 3];
 
reverse(array);
// => [3, 2, 1]
 
console.log(array);
// => [3, 2, 1]

reverse関数の実装コード(答えを見た後)

// 同じ
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