type_switch.go

var t interface{}
t = functionOfSomeType()
switch t := t.(type) {
default:
	fmt.Printf("unexpected type %T", t)       // %T prints whatever type t has
case bool:
	fmt.Printf("boolean %t\n", t)             // t has type bool
case int:
	fmt.Printf("integer %d\n", t)             // t has type int
case *bool:
	fmt.Printf("pointer to boolean %t\n", *t) // t has type *bool
case *int:
	fmt.Printf("pointer to integer %d\n", *t) // t has type *int
}