JS 配列のN個からN個までを取り出す - Qiita

const slice = (array = [], start = 0, end = array.length) => { const newArray = [] for (let i = start; i < end; i++) { newArray.push(array[i]) } return newArray } console.log(slice([1, 2, 3, 4, 5], 1, 4)) // => [ 2, 3, 4 ]