In today's article, I want to talk about Polymorphism in TypeScript, which is one of four pillars of object-orientated programming.

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What is Polymorphism?

Polymorphism is the ability to create a class that has more than one form. Or in other words, classes have the same methods but different implementations.

Example

So, before explaining how polymorphism works, I better show you, how it does not work by an example.

Imagine we have two animal classes, one class is called Dog, the other class is called Cat. Both classes should have the same properties and methods.

bad way

And that works fine, but actually, that is not the way to go. As I said, both classes have the exact same properties and methods, so it makes sense to inherit this from a parent class.

Let’s have a look at a better way:

good way

The results of the makeSound methods are exactly the same, but the approach is a little bit different.

Thanks for reading my article about Polypmorphism in TypeScript. I hope, I could refresh your knowledge with this quick example.

Cheers

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