Methods are functions

Remember: a method is just a function with a receiver argument.

Here's Abs written as a regular function with no change in functionality.

methods-funcs.go

  1. package main
  3. import (
  4.     "fmt"
  5.     "math"
  6. )
  8. type Vertex struct {
  9.     X, Y float64
  10. }
  12. func Abs(v Vertex) float64 {
  13.     return math.Sqrt(v.X*v.X + v.Y*v.Y)
  14. }
  16. func main() {
  17.     v := Vertex{3, 4}
  18.     fmt.Println(Abs(v))
  19. }