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The builder pattern is a design pattern commonly used in OOP. It is used to create complex objects step by step throught a series of methods, each of 阅读全文
posted @ 2023-02-13 16:41
Zhentiw
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file1: import { expect, it } from "vitest"; /** * Here, we've actually got _multiple_ problem files! * Make sure to to check problem.2.ts too. */ decl 阅读全文
posted @ 2023-02-10 21:09
Zhentiw
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We have the following code: class Form<TValues> { error?: string; constructor( public values: TValues, private validate: (values: TValues) => string | 阅读全文
posted @ 2023-02-10 21:03
Zhentiw
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import { it } from 'vitest'; import { Brand } from '../helpers/Brand'; type Valid<T> = Brand<T, 'Valid'>; interface PasswordValues { password: string; 阅读全文
posted @ 2023-02-10 20:44
Zhentiw
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import { it } from 'vitest'; import { Equal, Expect } from '../helpers/type-utils'; export const isDivElement = (element: unknown): element is HTMLDiv 阅读全文
posted @ 2023-02-10 20:38
Zhentiw
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import { expect, it } from "vitest"; import { Equal, Expect } from "../helpers/type-utils"; export const values = ["a", "b", undefined, "c", undefined 阅读全文
posted @ 2023-02-10 02:10
Zhentiw
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import { Equal, Expect } from "../helpers/type-utils"; const obj = { a: 1, b: 2, c: 3, } as const; type ObjKey = keyof typeof obj; //Type '"a"' is not 阅读全文
posted @ 2023-02-08 15:57
Zhentiw
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// You'll need to use function overloads to figure this out! function useData<T>(params: { fetchData: () => Promise<T>; initialData?: T }): { getData: 阅读全文
posted @ 2023-02-08 14:18
Zhentiw
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Define function / variable in global scope globalThis.myFunc = () => true; // doesn't compile globalThis.myVar = 1; // doesn't compile it("Should let 阅读全文
posted @ 2023-02-06 21:04
Zhentiw
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In this exercise, we're going to look at a really interesting property of branded types when they're used with index signatures. Here we have our User 阅读全文
posted @ 2023-02-06 03:38
Zhentiw
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