March 2020
Intermediate to advanced
376 pages
5h 9m
Japanese
Content preview from プログラミングTypeScript ―スケールするJavaScriptアプリケーション開発
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付録B型ユーティリティ
TypeScriptの型ユーティリティは、標準ライブラリーに組み込まれています。表B-1は、本書執筆時点で利用可能なすべての型ユーティリティを一覧にしたものです。
最新のリファレンスについては、es5.d.ts（http://bit.ly/2I0Ve2U）を参照してください。
表B-1 型ユーティリティ
| 型ユーティリティ | 使用対象 | 説明 |
|---|---|---|
ConstructorParameters | クラスコンストラクター型 | クラスコンストラクターのパラメーター型のタプル |
Exclude | 合併型 | 別の型に割り当て可能な型を除外する |
Extract | 合併型 | 別の型に割り当て可能な型を選択する |
InstanceType | クラスコンストラクター型 | クラスコンストラクターをnewすることで得られるインスタンス型 |
NonNullable | null許容型 | nullとundefinedを型から除外する |
Parameters | 関数型 | 関数のパラメーター型のタプル |
Partial | オブジェクト型 | オブジェクト内のすべてのプロパティをオプション（省略可能）にする |
Pick | オブジェクト型 | オブジェクト型のキーのうち、指定したもののみを持つそのオブジェクトのサブタイプ |
Omit | オブジェクト型 | オブジェクト型のキーのうち、指定したものを持たないそのオブジェクトのサブタイプ |
Readonly | 配列型、オブジェクト型、タプル型 | オブジェクト内のすべてのプロパティを読み取り専用にする。または、配列やタプルを読み取り専用にする |
ReadonlyArray | 任意の型 | 指定された型のイミュータブル（変更不能）な配列を作成する |
Record | オブジェクト型 | キーの型から値の型へのマッピング |
Required | オブジェクト型 | オブジェクト内のすべてのプロパティを必須にする ... |
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.