安全に[[配列 (JavaScript)|配列]]の一部要素を挿入/削除する[[配列 (JavaScript)|Arrayオブジェクト]]のメソッド。 ```js const xs = ["a", "i", "u"]; console.log(xs.toSpliced(1, 1)); // ["a", "u"] console.log(xs); // ["a", "i", "u"] ``` <button class="playground"><a href="https://www.typescriptlang.org/play?target=99&ts=5.2.2#code/MYewdgzgLgBAHhGBeGBtARAQ3QGhugS13wFd0BdAbgFgAoUSEAGwFMA6JkAcwAoE2oIAMoAHJgWAsAJjwCMeWQEpFNWgHo1aLMXRlydBhGbtOvBCroat2PIR166QA">Playground</a></button>