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【JavaScript関数ドリル】中級編のunion関数の実装アウトプット

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union関数の課題内容

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

「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/union/

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

  • 解答例では引数を受け取る際に、...で展開されているのが、参考になった。

union関数の実装コード(答えを見る前)

function union(arrays) {
    const unionArray = [];

    for (let i = 0; i < arguments.length; i++) {
        for (let j = 0; j < arguments[i].length; j++) {
            if (!unionArray.includes(arguments[i][j])) {
                unionArray.push(arguments[i][j]);
            }
        }
    }

    return unionArray;
}

union関数の実装コード(答えを見た後)

// 同じ
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