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javascript関数ドリル 初級編nth関数の実相のアウトプット

Last updated at Posted at 2020-09-11

##nth関数の課題内容
   ↓
https://js-drills.com/blog/nth/

##nth関数の取り組む前の状態
参考演算子が使えるんじゃないかと考えていた

##nth関数に取り組んだ後の状態
どちらのやり方でもできるように理解できた

##nth関数の実装コード(答えを見る前)

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

const array = ['a', 'b', 'c', 'd'];

##nth関数の実装コード(答えを見た後)

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

const array = ['a', 'b', 'c', 'd'];

console.log( nth(array, 1) );
// => 'b'

console.log( nth(array, -2) );
// => 'c';
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