What are generic constraints in TypeScript?

What are generic constraints in TypeScript?

Generic constraints in TypeScript allow you to restrict the types that can be used as type arguments in generics.

Can you give me an example of how to use generic constraints?

Sure! You can use the extends keyword to create a constraint. For example, function identity<T extends string>(arg: T): T { return arg; }.

What happens if I try to pass a number to that function?

If you try to pass a number, TypeScript will throw a compilation error because the type does not satisfy the constraint.

Are there any other ways to define constraints?

Yes, you can also use interfaces or types to define more complex constraints for generics.