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README.zh-CN.md 3.54 KB

<h1>Tuple to Enum Object <img src="https://img.shields.io/badge/-%E5%9B%B0%E9%9A%BE-de3d37" alt="困难"/> <img src="https://img.shields.io/badge/-%23tuple-999" alt="#tuple"/> <img src="https://img.shields.io/badge/-%23template--literal-999" alt="#template-literal"/></h1><blockquote><p>by Ryo Hanafusa <a href="https://github.com/softoika" target="_blank">@softoika</a></p></blockquote><p><a href="https://tsch.js.org/472/play/zh-CN" target="_blank"><img src="https://img.shields.io/badge/-%E6%8E%A5%E5%8F%97%E6%8C%91%E6%88%98-3178c6?logo=typescript&logoColor=white" alt="接受挑战"/></a> &nbsp;&nbsp;&nbsp;<a href="./README.md" target="_blank"><img src="https://img.shields.io/badge/-English-gray" alt="English"/></a>  <a href="./README.ja.md" target="_blank"><img src="https://img.shields.io/badge/-%E6%97%A5%E6%9C%AC%E8%AA%9E-gray" alt="日本語"/></a> </p>

枚举是 TypeScript 的一种原生语法（在 JavaScript 中不存在）。因此在 JavaScript 中枚举会被转成如下形式的代码：

```js
let OperatingSystem
;(function (OperatingSystem) {
  OperatingSystem[(OperatingSystem['MacOS'] = 0)] = 'MacOS'
  OperatingSystem[(OperatingSystem['Windows'] = 1)] = 'Windows'
  OperatingSystem[(OperatingSystem['Linux'] = 2)] = 'Linux'
})(OperatingSystem || (OperatingSystem = {}))
```

在这个问题中，你实现的类型应当将给定的字符串元组转成一个行为类似枚举的对象。此外，枚举的属性一般是 `pascal-case` 的。

```ts
Enum<['macOS', 'Windows', 'Linux']>
// -> { readonly MacOS: "macOS", readonly Windows: "Windows", readonly Linux: "Linux" }
```

如果传递了第二个泛型参数，且值为 `true`，那么返回值应当是一个 `number` 字面量。

```ts
Enum<['macOS', 'Windows', 'Linux'], true>
// -> { readonly MacOS: 0, readonly Windows: 1, readonly Linux: 2 }
```

<br><a href="../../README.zh-CN.md" target="_blank"><img src="https://img.shields.io/badge/-%E8%BF%94%E5%9B%9E%E9%A6%96%E9%A1%B5-grey" alt="返回首页"/></a> <a href="https://tsch.js.org/472/answer/zh-CN" target="_blank"><img src="https://img.shields.io/badge/-%E5%88%86%E4%BA%AB%E4%BD%A0%E7%9A%84%E8%A7%A3%E7%AD%94-teal" alt="分享你的解答"/></a> <a href="https://tsch.js.org/472/solutions" target="_blank"><img src="https://img.shields.io/badge/-%E6%9F%A5%E7%9C%8B%E8%A7%A3%E7%AD%94-de5a77?logo=awesome-lists&logoColor=white" alt="查看解答"/></a> <hr><h3>相关挑战</h3><a href="https://github.com/type-challenges/type-challenges/blob/main/questions/00010-medium-tuple-to-union/README.zh-CN.md" target="_blank"><img src="https://img.shields.io/badge/-10%E3%83%BB%E5%85%83%E7%BB%84%E8%BD%AC%E5%90%88%E9%9B%86-d9901a" alt="10・元组转合集"/></a>  <a href="https://github.com/type-challenges/type-challenges/blob/main/questions/00011-easy-tuple-to-object/README.zh-CN.md" target="_blank"><img src="https://img.shields.io/badge/-11%E3%83%BB%E5%85%83%E7%BB%84%E8%BD%AC%E6%8D%A2%E4%B8%BA%E5%AF%B9%E8%B1%A1-7aad0c" alt="11・元组转换为对象"/></a>  <a href="https://github.com/type-challenges/type-challenges/blob/main/questions/00730-hard-union-to-tuple/README.md" target="_blank"><img src="https://img.shields.io/badge/-730%E3%83%BBUnion%20to%20Tuple-de3d37" alt="730・Union to Tuple"/></a>  <a href="https://github.com/type-challenges/type-challenges/blob/main/questions/03188-medium-tuple-to-nested-object/README.md" target="_blank"><img src="https://img.shields.io/badge/-3188%E3%83%BBTuple%20to%20Nested%20Object-d9901a" alt="3188・Tuple to Nested Object"/></a>

一键复制编辑原始数据按行查看历史

提交于 2023-01-11 00:37 . chore: update index

Tuple to Enum Object

by Ryo Hanafusa @softoika

枚举是 TypeScript 的一种原生语法（在 JavaScript 中不存在）。因此在 JavaScript 中枚举会被转成如下形式的代码：

let OperatingSystem
;(function (OperatingSystem) {
  OperatingSystem[(OperatingSystem['MacOS'] = 0)] = 'MacOS'
  OperatingSystem[(OperatingSystem['Windows'] = 1)] = 'Windows'
  OperatingSystem[(OperatingSystem['Linux'] = 2)] = 'Linux'
})(OperatingSystem || (OperatingSystem = {}))

在这个问题中，你实现的类型应当将给定的字符串元组转成一个行为类似枚举的对象。此外，枚举的属性一般是 pascal-case 的。

Enum<['macOS', 'Windows', 'Linux']>
// -> { readonly MacOS: "macOS", readonly Windows: "Windows", readonly Linux: "Linux" }

如果传递了第二个泛型参数，且值为 true，那么返回值应当是一个 number 字面量。

Enum<['macOS', 'Windows', 'Linux'], true>
// -> { readonly MacOS: 0, readonly Windows: 1, readonly Linux: 2 }

相关挑战

730・Union to Tuple

3188・Tuple to Nested Object

1

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