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Go supports interfaces in a different way than other programming languages like Java does. Like a struct, an interface is created using the type keyword, followed by a name and the keyword interface. Click here to learn more
type Shape interface {
// area returns the Square's area by multiplying both sides.
area() float64
}
// Now in order to "implement" this interface,
// a type must implement the interface methods defined. For example:
type Square struct {
x1, y1, x2, y2 float64
}
func (s *Square) area() float64 {
return math.Abs((s.x2 - s.x1) * (s.y2 - s.y1))
}
func measure(s Shape) float64 {
return s.area()
}
func main() {
// create new 5x5 Square
s := Square{0, 0, 5, 5}
// print the Square's area via the Shape interface
fmt.Println(measure(&s)) // 25
}25