Go by Example: Methods
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Go supports methods defined on struct types. |
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package main |
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import "fmt" |
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type user struct { name string email string } |
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value receiver will only works on the copy of struct |
func (u user) notify() { fmt.Printf("Sending email to %s<%s>\n", u.name, u.email) |
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will not change because this method is a value receivere. warning: ineffective assignment to field user.name |
u.name = "will not change"
}
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will de-reference to (*u).email under the hood |
func (u *user) changeEmail(email string) { |
u.email = email } |
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func main() { ua := user{name: "Tom", email: "tom@gmail.com"} ub := user{name: "Ben", email: "ben@gmail.com"} ua.notify() fmt.Println("ua.name", ua.name) ua.changeEmail("tom@newdomain.com") fmt.Println("ua.email", ua.email) ub.changeEmail("ben@newdomain.com") fmt.Println("ub.email", ub.email) } |
$ go run methods.go Sending email to Tom<tom@gmail.com> ua.name Tom ua.email tom@newdomain.com ub.email ben@newdomain.com |
Next example: Channel: Merge.