Methods

Go does not have classes. However, you can define methods on types.

A method is a function with a special receiver argument.

The receiver appears in its own argument list between the func keyword and the method name.

In this example, the Abs method has a receiver of type Vertex named v.

methods.go

  1. package main
  3. import (
  4.     "fmt"
  5.     "math"
  6. )
  8. type Vertex struct {
  9.     X, Y float64
  10. }
  12. func (v Vertex) Abs() 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(v.Abs())
  19. }