YouTipWhat is TypeScript?
TypeScript adds static typing to JavaScript. It catches errors at compile time.
Basic Types
let name: string = "Alice";
let age: number = 25;
let active: boolean = true;
let items: string[] = ["a", "b"];
let id: string | number = 1;Interfaces
interface User {
id: number;
name: string;
email?: string; // optional
}
const user: User = { id: 1, name: "Alice" };Summary
- TypeScript adds types on top of JavaScript
- Interfaces define object shapes