What are type constraints in generics?

What are type constraints in generics?

Type constraints in generics allow you to specify the types that can be used as arguments for a generic type. This ensures that the type passed meets certain criteria.

Can you give me an example of type constraints in TypeScript?

Sure! In TypeScript, you can use the extends keyword to create a constraint. For example: function identity<T extends string>(arg: T): T { return arg; } This function only accepts string types.

Why are type constraints useful?

They help catch errors at compile time, ensuring that the code is type-safe and that the generic types used conform to expected structures.

What happens if I don't use type constraints?

Without type constraints, you might end up with runtime errors or unexpected behavior, as the generic type could be anything, leading to potential type mismatches.