Go: Google's Plan9 refugees are staging a breakout

The Something Awful Forums > Discussion > Serious Hardware/Software Crap > The Cavern of COBOL > Go: Google's Plan9 refugees are staging a breakout

Zaxxon: Feb 14, 2004; Wir Tanzen Mekanik

Winkle-Daddy posted:

My question is, can the Name() function take parameters through an interface? What would be the suggested method for passing arguments be? The only way I could think to do it in this example would be to extend the User struct to include any options I want set, then set them when I dereference into the variable "u" which (should) make it accessible to the function the interface calls. That feels kind of dirty though, would that be considered the "go way" of doing things?

e: sorry if this is a dumb question, it's just that everyone says "Start doing things the go way to learn better!" and I'm not exactly sure what the go way is in this case.

I'm not sure what you mean here but you can just pass arguments like a normal function.

code:

package main

import (
	"fmt"
)

type User struct {
	FirstName, LastName string
}

func (u *User) Name(pointlessArg int) string {
	return fmt.Sprintf("%s %s %d", u.FirstName, u.LastName, pointlessArg)
}

type Namer interface {
	Name(int) string
}

func Greet(n Namer) string {
	return fmt.Sprintf("Dear %s", n.Name(15))
}

func main() {
	u := &User{"Matt", "Aimonetti"}
	fmt.Println(Greet(u))
}

# ¿ Aug 28, 2015 22:24

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# ¿ May 4, 2024 12:47

Zaxxon: Feb 14, 2004; Wir Tanzen Mekanik

Winkle-Daddy posted:

Hmm, okay, but here:
code:
func main() {
	u := &User{"Matt", "Aimonetti"}
	fmt.Println(Greet(u))
}
What's the syntax for getting my argument into the function since u was passed into Greet? This part is my specific question, which I probably could have asked better.

well, "Greet" doesn't really support this, but greet isn't part of the interface.

All the interface declaration states is that if "x" is a Namer you will be able to do x.Name() and get a string. If the interface states that x.Name takes some arguments it's up to the caller to pass those arguments.

# ¿ Aug 28, 2015 22:44

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