📘arr.splice()

⭐️ 注意：arr.splice() 會截斷原陣列、插入新元素，並回傳「被截掉的部分」❗️)

💈範例

//              splice here ↴
//            0        1    |    2           3
let fish = ['angel', 'clown', 'mandarin', 'sturgeon']
//          ╰── ⭐️ fish ───╯  ╰──── ⭐️ removed ─────╯  
// (after splice)
// fish === ['angel', 'clown']      // ⭐️ original arr

let removed = fish.splice(2)        // "removed" will be returned

📘 手冊

• .splice() - 截斷原陣列、插入新元素。(⭐️ 注意：會回傳「被截掉的部分」❗️)

👥 相關

• don't get confused with arr.slice().

• there's another str.splice() for strings.