Go by Example: Interfaces

For our example we’ll implement this interface on rect and circle types. type rect struct { width, height float64 } type circle struct { radius float64 } To implement an interface in Go, we just need to implement all the methods in the interface. Here we implement geometry on rects. func (r rect) area() float64 { return r.width * r.height } func (r rect) perim() float64 { return 2*r.width + 2*r.he