Luis Gustavo Macedo Luisgustavom1

In search of knowledge and new experiences!! JS - TS - Node - ReactJs - NextJs - Golang

Luisgustavom1 / Diff.ts

Created August 25, 2022 12:54

	type Diff<
	Obj1,
	Obj2,
	SameKeys extends keyof Obj1 = keyof Obj1 & keyof Obj2
	> = Omit<{
	[K in (keyof Obj1 \| keyof Obj2)]:
	K extends keyof Obj1
	? Obj1[K]
	: K extends keyof Obj2
	? Obj2[K]

Luisgustavom1 / Reverse.ts

Last active August 25, 2022 12:55

This is a reverse string using type level of typescript

	type Reverse<A extends string> =
	`${A}` extends `${infer H}${infer T}`
	? `${Reverse<T>}${H}`
	: A

Luisgustavom1 / kebabcase.ts

Created July 31, 2022 23:04

Type-challenges - 612 Medium kebabcase

	// 00612 - Medium kebabcase
	type KebabCase<T extends string> =
	T extends `${infer F}${infer R}`
	? R extends Uncapitalize<R>
	? `${Uncapitalize<F>}${KebabCase<R>}`
	: `${Uncapitalize<F>}-${KebabCase<R>}`
	: T

	export type KebabCaseResult = KebabCase<'FooBarBaz'> //foo-bar-baz

Luisgustavom1 / Promise-all.ts

Last active August 25, 2022 12:57

	type PromiseAllType<P> =
	P extends []
	? []
	: P extends [Promise<infer T> \| infer T, ...infer F]
	? [T, ...PromiseAllType<F>]
	: never

	declare function PromiseAll<P extends any[]>(args: readonly [...P]): Promise<PromiseAllType<P>>

	const promise1 = Promise.resolve(3);

Luisgustavom1 / type-helpers.ts

Last active July 31, 2022 16:36

This is a types helper based on the specific types of properties. Created in this article to practice and study https://dev.to/busypeoples/notes-on-typescript-type-level-programming-part-3-3l03

	type User = {
	id: number,
	name: string,
	age: number,
	active: boolean,
	}

	type FilterByType<T, U> = {
	[K in keyof T]: T[K] extends U ? K : never
	}[keyof T]