Pointer Receivers

Pointer receiver methods can update the value they are called on.

pointer_receiver.go

package main

import "fmt"

type Counter struct {
	Value int
}

func (c *Counter) Add(delta int) {
	c.Value += delta
}

func main() {
	var step = 
	counter := Counter{Value: 2}
	counter.Add(step)

	fmt.Println("step=", step)
	fmt.Println("value=", counter.Value)
}

package main

import "fmt"

type Counter struct {
	Value int
}

func (c *Counter) Add(delta int) {
	c.Value += delta
}

func main() {
	var step = 
	counter := Counter{Value: 2}
	counter.Add(step)

	fmt.Println("step=", step)
	fmt.Println("value=", counter.Value)
}

package main

import "fmt"

type Counter struct {
	Value int
}

func (c *Counter) Add(delta int) {
	c.Value += delta
}

func main() {
	var step = 
	counter := Counter{Value: 2}
	counter.Add(step)

	fmt.Println("step=", step)
	fmt.Println("value=", counter.Value)
}

pointer receiver A method with a pointer receiver can modify fields on the original value.