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package main
import (
// We need to declare a type Convert
// which is a function which takes a string as an argument
// and returns a string
type Convert func(string) string
// first convert function
func ask(smth string) string {
return fmt.Sprintf("%s????", smth)
// second convert function
func exclamate(smth string) string {
return fmt.Sprintf("%s!!!!", smth)
// convert takes a string and a function which is of type Convert
func convert(smth string, fn Convert) string {
return fmt.Sprintf("%s", fn(smth))
func main() {
fmt.Println(convert("what", ask)) // produces "what???"
fmt.Println(convert("what", exclamate)) // produces "what!!!"
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