[go-nuts] Interface vs first-class function

[Henry]

Hi,

I am wondering from best practice point of view whether it is better to use 
interface or first-class function, especially considering that Go encourages 
the use of small interfaces. Here is an example:

type SomethingDoer interface{
   DoSomething(data Data)
}

func PerformWork(doer SomethingDoer){
   //...
}

Or 

type SomethingDoer func(Data)

func PerformWork(doer SomethingDoer){
   //...
}

Is there some sort of a guideline when to use one vs the other? They seem like 
redundant features to me.

Thanks

Henry

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