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

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difference関数の課題内容

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

「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/difference/

課題に取り組む前の状態

  • 解答例を見なくてもできそうと思った。

課題に取り組んだ後の状態

  • 解答例では引数が配列でない場合の処理を実装しているので、その点も考慮できるようにしたい。

difference関数の実装コード(答えを見る前)

function difference(array, values) {
  const diffArray = [];

  if (!Array.isArray(values)) {
    return [...array];
  }

  for (let i = 0; i < array.length; i++) {
    if (!values.includes(array[i])) {
      diffArray.push(array[i]);
    }
  }

  return diffArray;
}

console.log(difference([2, 1], [2, 3]));
// => [1]

difference関数の実装コード(答えを見た後)

function difference(array, values) {
    const diffArray = [];

    if (!Array.isArray(values)) {
        return [...array];
    }

    for (let i = 0; i < array.length; i++) {
        if (!values.includes(array[i])) {
            diffArray.push(array[i]);
        }
    }

    return diffArray;
}
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