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JS 配列の最初以外を返す

Last updated at Posted at 2020-08-02

Lodashのtail関数を作成してみた

メソッド使用せずに作成した場合

const tail = (array) => {
  const tailNewArray = []
  for (let i = 1; i < array.length; i++) {
    tailNewArray.push(array[i])
  }
  return tailNewArray
}

console.log(tail([2, 4, 5]))
// => [4, 5]

console.log(tail([1]))
// => []

filterメゾッドを使用した場合

const tail = (numbers = []) => {
  return numbers.filter((value, index, array) => {
    return array.indexOf(value) !== 0
  })
}
console.log(tail([2, 4, 5]))
// => [4, 5]

console.log(tail([1]))
// => []
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