What is the difference between TypeScript interfaces and types?

What is the difference between TypeScript interfaces and types?

In TypeScript, both interfaces and types can be used to define the shape of an object, but they have some differences. Interfaces are specifically designed for object shapes and can be extended or implemented, while types 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 or objects that will implement it. For example, if you have a class that represents a user, you might define an interface like User with properties like name and age.

Are there any scenarios where I should prefer types over interfaces?

Yes, you might prefer types when you need to create union types or when you want to use advanced type features like mapped types. For instance, if you want to define a type that can be either a string or a number, you would use a type.

Can interfaces and types be used interchangeably?

In many cases, yes, but there are specific scenarios where one is more suitable than the other. It's important to understand their unique features to choose the right one for your needs.