What are abstract classes in TypeScript?

What are abstract classes in TypeScript?

Abstract classes in TypeScript are base classes that cannot be instantiated directly. They can contain abstract methods that must be implemented by derived classes.

Can you give me an example of an abstract class?

Sure! Here's a simple example:

abstract class Animal {
    abstract makeSound(): void;
}

class Dog extends Animal {
    makeSound() {
        console.log('Woof!');
    }
}

In this example, Animal is an abstract class with an abstract method makeSound, which is implemented in the Dog class.

What happens if a derived class doesn't implement the abstract method?

If a derived class does not implement the abstract method, TypeScript will throw a compilation error, ensuring that all abstract methods are defined.

Are there any use cases for abstract classes?

Yes, abstract classes are useful for defining a common interface for a group of related classes, promoting code reusability and enforcing a contract for derived classes.