Why create a variable of an interface type? (Tour of Go, methods, 10)

Getting Help
1

I’m kind of stuck on this part of the “Tour of Go”:
https://tour.golang.org/methods/10

I understand what’s happening, but I can’t yet understand why it’s done this way?
var i I = T{"hello"}

Why would pass the variable i transitionally through the interface type?
Afterall, it seems you get the same resulting type (main.T) regardless.
It makes more sense to me to just:
i := T{"Hello"}

What am I missing logically here? I’m just trying to understand.

2

You are missed the type of variable.

var i I = T{"hello"}//type I
i := T{"Hello"}//type T

Edit:
The key here is show the interface can contain any type that fit the interface. If you don’t need the interface you just create variable single type.

3

But would you ever use that in actual code? Would there be a purpose other than educational?

4

Hi. https://play.golang.org/p/KLnZyLn-Zue here is the variable shapes and shape of the interface type Areable.

5

Great, that makes sense now. Thanks!

1 Like
6

This topic was automatically closed 90 days after the last reply. New replies are no longer allowed.