Tour of Go 2.0

Methods are functions

A method is just a function with a receiver. That’s it.

Here’s Abs rewritten as a plain function — same logic, no receiver. The result is identical.

Try it: compare this to the previous example. The only structural difference is where v appears.

main.go ▶ Run in Playground 
package main

import (
	"fmt"
	"math"
)

type Vertex struct {
	X, Y float64
}

func Abs(v Vertex) float64 {
	return math.Sqrt(v.X*v.X + v.Y*v.Y)
}

func main() {
	v := Vertex{3, 4}
	fmt.Println(Abs(v))
}