typescript keyof
interface Person {
name: string;
age: number;
location: string;
}
type K1 = keyof Person; // "name" | "age" | "location"
type K2 = keyof Person[]; // "length" | "push" | "pop" | "concat" | ...
type K3 = keyof { [x: string]: Person }; // stringtypescript pick
interface Tarea {
titulo: string;
descripcion: string;
completado: boolean;
}
type TareaReducido = Pick<Tarea, "titulo" | "descripcion">;
const tarea: TareaReducido = {
titulo: "Limpiar Recamara",
descripcion: "Poner en orden todo lo que existe en la recamara",
};typescript record
interface PageInfo {
title: string;
}
type Page = "home" | "about" | "contact";
const nav: Record<Page, PageInfo> = {
about: { title: "about" },
contact: { title: "contact" },
home: { title: "home" },
};
nav.about;
// ^ = Could not get LSP result: v.a>bTrytypescript pick
type TodoPreview = Pick<Todo, "title" | "completed">;typescript utility types merge interfaces
interface A {
x: string
}
interface B extends Omit<A, 'x'> {
x: number
}Copyright © 2021 Codeinu
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