Interfaces are named collections of method signatures.
package main import ( "fmt" "math" ) type geometry interface { area() float64 perim() float64 } type rect struct { width, height float64 } type circle struct { radius float64 } func (r rect) area() float64 { return r.width * r.height } func (r rect) perim() float64 { return 2*r.width + 2*r.height } func (c circle) area() float64 { return math.Pi * c.radius * c.radius } func (c circle) perim() float64 { return 2 * math.Pi * c.radius } func measure(g geometry) { fmt.Println(g) fmt.Println(g.area()) fmt.Println(g.perim()) } func main() { r := rect{width: 3, height: 4} c := circle{radius: 5} measure(r) measure(c) }
References
Reference | URL |
---|---|
Interfaces - Go By Example | https://gobyexample.com/interfaces |
Interfaces in Go | https://medium.com/rungo/interfaces-in-go-ab1601159b3a |