How to compare variable types with .(type) in Golang?

Question

I'm quite confused about the .(type) syntax for interface variables. Is it possible to use it like this:
var a,b interface{}
// some code
if first.(type) == second.(type) {
}

or is reflect.TypeOf() the only option to check if the underlying types of a and b are the same type? What comparison am I making in the code above?

Chris Gregori · Accepted Answer

someInterface.(type) is only used in type switches. In fact if you tried to run that you'd see that in the error message. func main() { var a, b interface{} a = 1 b = 1 fmt.Println(a.(type) == b.(type)) } prog.go:10: use of .(type) outside type switch What you could do instead is a.(int) == b.(int), which is really no different from int(a) == int(b)

Go Language

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