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javascript関数ドリル 初級編take関数の実相のアウトプット

Posted at

take関数の課題内容

   ↓

take関数の取り組む前の状態

大体作る前からどうすればいいかわかっていた

take関数に取り組んだ後の状態

自力でできた

tail関数の実装コード(答えを見る前)

function take(array, n = 1) {
  if(n === 0) {
    return [];
  }
  if(n > array.length) {
    return [...array];
  }

  const takenValues = [];
  for(let i = 0; i < n; i++) {
    takenValues.push( array[i] );
  }

  return takenValues;
}

tail関数の実装コード(答えを見た後)


function take(array, n = 1) {
  if(n === 0) {
    return [];
  }
  if(n > array.length) {
    return [...array];
  }

  const takenValues = [];
  for(let i = 0; i < n; i++) {
    takenValues.push( array[i] );
  }

  return takenValues;
}

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

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

console.log( take([1, 2, 3], 5) );
// => [1, 2, 3]

console.log( take([1, 2, 3], 0) );
// => []
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