How do I use generic interfaces in TypeScript?

How do I use generic interfaces in TypeScript?

Generic interfaces in TypeScript allow you to create reusable components that can work with any data type. You define a generic interface using angle brackets, like this: interface GenericInterface<T> { ... }. What specific use case do you have in mind?

I want to create a function that accepts an array of any type.

You can define a generic function like this: function processArray<T>(arr: T[]): void { ... }. This way, T can represent any type, and you can use it within the function.

Can you give me an example of using it with a specific type?

Sure! If you want to process an array of numbers, you can call processArray<number>([1, 2, 3]). Inside the function, T will be number, allowing you to work with numbers specifically.

What if I want to use it with multiple types?

You can use union types in your generic interface. For example, function processArray<T>(arr: T[]): void can accept arrays of different types, like processArray<number | string>([1, 'two', 3]).