What are the differences between TypeScript interfaces and type aliases?

What are the differences between TypeScript interfaces and type aliases?

TypeScript interfaces and type aliases are both used to define types, but they have some key differences. Interfaces are primarily used for defining the shape of objects, while type aliases can define any type, including primitives, unions, and tuples.

Can you give me an example of when to use an interface?

Sure! Use an interface when you want to define the structure of an object that will be implemented by classes. For example, you might define an interface for a user object with properties like name and age.

And when should I use a type alias instead?

Use a type alias when you need to create a union type or when you want to define a more complex type. For instance, you can create a type alias for a union of string and number types.

Are there any performance differences between the two?

No, there are no significant performance differences between interfaces and type aliases. The choice between them is mostly about readability and use case.