What is the difference between interfaces and types in TypeScript?

What is the difference between interfaces and types in TypeScript?

In TypeScript, both interfaces and types can be used to define the shape of an object, but they have some differences. Interfaces are primarily used for defining object structures and can be extended or implemented by classes. Types, on the other hand, can represent any valid TypeScript type, including primitives, unions, and intersections.

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

Sure! Use an interface when you want to define a contract for classes. For example, if you have a class that implements a specific behavior, you can define an interface for that behavior and ensure that the class adheres to it.

What about using types? When should I prefer them?

Types are more flexible. You might prefer using types when you need to create unions or intersections, or when you want to define a type that can be a combination of different types. For instance, you can create a type that can be either a string or a number.

Are there any performance differences between using interfaces and types?

Generally, there are no significant performance differences between interfaces and types in TypeScript. The choice between them is more about design and readability than performance.