paidaxing-web/you-don-t-know-ts

🔥🔥🔥 这是一个专注研究Typescript的网站，🎖🎖🎖在这里你可以全面深入学习Typescript相关知识,通过动画方式讲解TS，还有很多常见问题解答。你还可以挑战相应的题目，快来学习吧。

you-don-t-know-ts's Issues

2-1-实现Get-Return-Type.md

//你的答案
type MyReturnType<T> = T extends (...args: any[]) => infer R ? R : T;

1-14实现-unshift.md

//你的答案
type Unshift<T extends unknown[], U> = [U, ...T]

1.3.实现Awaited

type MyAwaited<T,K>={
[P in K]:T[P]

1.2.实现Pick

type MyPick<T, K extends keyof T> ={
[P in K]:T[P]
};

2-2实现-omit.md

//你的答案
type MyOmit<T, K> = { [P in keyof T as P extends K ? never : P]: T[P] };

1.3.实现Awaited

/* _____________ 你的代码 _____________ */

type MyAwaited<T> = T extends Promise<infer U>
  ? MyAwaited<U>
  : T extends { then: (p: (arg: infer K) => any) => any }
  ? K
  : T;

/* _____________ 测试用例 _____________ */
import type { Equal, Expect } from '@type-challenges/utils';

type X = Promise<string>;
type Y = Promise<{ field: number }>;
type Z = Promise<Promise<string | number>>;
type Z1 = Promise<Promise<Promise<string | boolean>>>;
type T = { then: (onfulfilled: (arg: number) => any) => any };

type cases = [
  Expect<Equal<MyAwaited<X>, string>>,
  Expect<Equal<MyAwaited<Y>, { field: number }>>,
  Expect<Equal<MyAwaited<Z>, string | number>>,
  Expect<Equal<MyAwaited<Z1>, string | boolean>>,
  Expect<Equal<MyAwaited<T>, number>>
];

// @ts-expect-error
type error = MyAwaited<number>;

1.2.实现Pick

type MyPick<T, K extends keyof T> = {

  [P in K]:T[P]
};

2-3-实现Readonly2.md

type MyReadonly2<T, K extends keyof T = keyof T> = Omit<T, K> & Readonly<T>;
//你的答案

1.1.hello-world

// 你的答案

2-2实现-omit.md

//你的答案
type MyOmit<T, K> = { [P in keyof T as P extends K ? never : P]: T[P] };

1.1.hello-world

type HelloWorld = string;

1-13实现-push.md

//你的答案
type Unshift<T extends unknown[], U> = [U, ...T]

1.1.hello-world

type HelloWorld =string;

1-13实现-push.md

//你的答案
type Unshift<T extends unknown[], U> = [U, ...T]

1.1.hello-world

// 你的答案
import './style.css';
import type { Equal, Expect, NotAny } from '@type-challenges/utils';
// Write TypeScript code!
const appDiv: HTMLElement = document.getElementById('app');
appDiv.innerHTML = `<h1>第一题:Hello World</h1><p> 你需要使得14行不会抛出异常</p>`;

// 期望是一个 string 类型
type HelloWorld = string;
//你需要使得如下这行不会抛出异常
type cases = [Expect<NotAny<HelloWorld>>, Expect<Equal<HelloWorld, string>>];

1.2.实现Pick

type MyPick<T, K extends keyof T> = {[F in K]:T[F]};

1-hello World

// 你的答案

1.1.hello-world

type HelloWorld = string;

1.1.hello-world