What are some examples of TypeScript interfaces?

Can you give me some examples of TypeScript interfaces?

Sure! An interface in TypeScript is a way to define the structure of an object. For example:

interface User {
    id: number;
    name: string;
    email: string;
}

This defines a User interface with three properties.

What if I want to make a nested interface?

You can definitely create nested interfaces! For instance:

interface Address {
    street: string;
    city: string;
}

interface User {
    id: number;
    name: string;
    email: string;
    address: Address;
}

Here, the User interface includes an Address interface.

Can interfaces extend other interfaces?

Yes, interfaces can extend other interfaces. For example:

interface Person {
    name: string;
    age: number;
}

interface Employee extends Person {
    employeeId: number;
}

The Employee interface extends the Person interface.

What about optional properties in interfaces?

You can define optional properties using a question mark. For example:

interface User {
    id: number;
    name: string;
    email?: string; // optional
}

In this case, the email property is optional.