bootdotdev-fcc-learn-golang-assets/course/11-pointers/exercises/5-pointer_receiver/readme.md

Pointer Receivers

A receiver type on a method can be a pointer.

Methods with pointer receivers can modify the value to which the receiver points. Since methods often need to modify their receiver, pointer receivers are more common than value receivers.

Pointer receiver

type car struct {
	color string
}

func (c *car) setColor(color string) {
	c.color = color
}

func main() {
	c := car{
		color: "white",
	}
	c.setColor("blue")
	fmt.Println(c.color)
	// prints "blue"
}

Non-pointer receiver

type car struct {
	color string
}

func (c car) setColor(color string) {
	c.color = color
}

func main() {
	c := car{
		color: "white",
	}
	c.setColor("blue")
	fmt.Println(c.color)
	// prints "white"
}