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TypedArray.prototype.slice() - JavaScript | MDN
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TypedArray.prototype.slice()
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2016年9月.
slice() は TypedArray インスタンスのメソッドで、型付き配列の一部を start から end （end は含まれない）まで選択された新しい型付き配列オブジェクトにコピーして返します。元の型付き配列は変更されません。このメソッドは Array.prototype.slice() と同じアルゴリズムです。
試してみましょう
const uint8 = new Uint8Array([10, 20, 30, 40, 50]);
const array1 = uint8.slice(1, 3);
console.log(array1);
// Expected output: Uint8Array [20, 30]
構文
js
slice()
slice(start)
slice(start, end)
引数
返値
抽出された要素が入った新しい型付き配列です。
解説
詳細については、 Array.prototype.slice() をご覧ください。このメソッドは汎用的ではなく、型付き配列インスタンスに対してのみ呼び出すことができます。
例
例: 既存の配列の一部を返す
js
const uint8 = new Uint8Array([1, 2, 3]);
uint8.slice(1); // Uint8Array [ 2, 3 ]
uint8.slice(2); // Uint8Array [ 3 ]
uint8.slice(-2); // Uint8Array [ 2, 3 ]
uint8.slice(0, 1); // Uint8Array [ 1 ]
仕様書
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-%typedarray%.prototype.slice |
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