Suppose you declare a function type
type mapFunc func(value int) int
Can you declare a function by using this type without duplicating it? Something like:
doubleIt := mapFunc {
return 2*value
}
As far as I know, the shortest way is still:
doubleIt := func (value int) int {
return value * 2
}
So it's not getting any shorter, and I don't think it would be more readable to decouple the function signature from its body. The benefit of declaring a named func type is using it in other declarations.
No extra conversions like doubleId := mapFunc(func...) needed, because of the type identity rules:
Two function types are identical if they have the same number of parameters and result values, corresponding parameter and result types are identical, and either both functions are variadic or neither is. Parameter and result names are not required to match.
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