Classes with Types

TypeScript classes work like JavaScript classes, with types added to fields, parameters, and return values.

class User {
    name: string;
    role: string;

    constructor(name: string, role: string = "member") {
        this.name = name;
        this.role = role;
    }

    isAdmin(): boolean {
        return this.role === "admin";
    }
}

const ada = new User("Ada", "admin");
console.log(ada.isAdmin());

Expected output

true

A class can also implements an interface, requiring it to provide every property/method the interface declares.