What are interfaces in Go and how can I use them effectively?

What are interfaces in Go and how can I use them effectively?

Interfaces in Go are types that specify a contract by defining methods. They allow for polymorphism and decoupling.

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

Sure! Here's a simple example:

type Shape interface {
    Area() float64
}

type Circle struct { Radius float64 }

func (c Circle) Area() float64 {
    return math.Pi * c.Radius * c.Radius
}

How do I implement multiple interfaces in a single struct?

You can implement multiple interfaces by defining all the required methods in your struct. For example:

type Drawable interface {
    Draw()
}

type Shape interface {
    Area() float64
}

type Square struct { Side float64 }

func (s Square) Area() float64 {
    return s.Side * s.Side
}

func (s Square) Draw() {
    fmt.Println("Drawing a square")
}

What are some common use cases for interfaces in Go?

Common use cases include defining behavior for different types, creating mock objects for testing, and implementing design patterns like Strategy or Observer.