配列を使って一気に変数を宣言する際に、,やスプレッド構文を使って
- 特定の値の取得
- いらない値の選別
ができる
const a = [1,2,3,4,5]
const [ ,b,...rest] = a
console.log(b,rest) // 2 [ 3, 4, 5 ]
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