What are interfaces in Go and how do they work?

What are interfaces in Go and how do they work?

Interfaces in Go are types that specify a contract of methods. They allow different types to be treated as the same type if they implement the same methods.

Can you give me an example of an interface in Go?

Sure! Here's a simple example:

type Animal interface {
    Speak() string
}

type Dog struct {}

func (d Dog) Speak() string {
    return "Woof!"
}

func main() {
    var a Animal = Dog{}
    fmt.Println(a.Speak()) // Outputs: Woof!
}

What are the benefits of using interfaces?

Interfaces promote flexibility and decoupling in your code. They allow you to write functions that can work with any type that implements the interface, making your code more modular.

Are there any limitations to using interfaces?

Yes, one limitation is that interfaces can only define method signatures, not data. Also, type assertions can introduce complexity.