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【JavaScript関数ドリル】初級編のnth関数の実装アウトプット

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nth関数の課題内容

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

「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/nth/

課題に取り組む前の状態

  • 解答例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

  • ちょっと時間がかかった
  • 1行で済ませる書き方がまだわかっていなかった

nth関数の実装コード(答えを見る前)


function nth(arr, n = 0) {
    
    if (n < 0) {
        return arr[n + arr.length];
    } else {
        return arr[n];
    }
}

nth関数の実装コード(解答例)


function nth(array, n = 0) {
  return n >= 0 ? array[n] : array[array.length + n];
}

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