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補足: 値レシーバとポインタレシーバ
Structに対して値レシーバーを付ける場合とポインタレシーバを付ける場合で挙動が異なります。
ポインタレシーバが多く使われますが、Immutableなオブジェクトを作成する際には値レシーバーが使われることもあります。
Immutableな例: UUID
こちらの構造体はNewしたあと値を更新しない前提で作られています。
https://godoc.org/github.com/google/uuid#UUID
mutableな例: Image
https://github.com/syuta-sugawara/go_training/blob/master/images.go#L29
imageパッケージ公式でのImage interfaceの実装として、RGBAは値を変更する前提でポインタレシーバーを利用して設計されています。もしこちらが値レシーバーで設計されてしまっていると、以下のSetのようなFunctionは利用できません。
https://golang.org/pkg/image/#RGBA
func (p *RGBA) Set(x, y int, c color.Color)
少し古い記事ですが、以下の記事を読むとより理解が深まるかと思います。
https://skatsuta.github.io/2015/12/29/value-receiver-pointer-receiver/
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