Introduction to Interfaces

In TypeScript, an interface is used to define the shape of an object. It specifies the properties, methods, and their types that an object must have.

Defining an Interface

Here's an example of how to define an interface:

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

Using an Interface

Once you've defined an interface, you can use it to type-check objects:

const person: Person = {
    name: 'John Doe',
    age: 30
};

Extending an Interface

You can extend an interface using the extends keyword:

interface Employee extends Person {
    department: string;
}

Implementing an Interface

You can implement an interface using the implements keyword:

class PersonImpl implements Person {
    name: string;
    age: number;

constructor(name: string, age: number) {
        this.name = name;
        this.age = age;
    }
}