Ghetto idea of optional callbacks

main.go

package main

import "fmt"
import "reflect"

func main() {
	fn1 := createCallback()
	fn1()

	fn2 := createCallback(func() {
		fmt.Println("sweet")
	})
	fn2()
}

func createCallback(args ...interface{}) func() {
	return func() {
		if 0 == len(args) {
			return
		}

		v := reflect.ValueOf(args[0])
		v.Call([]reflect.Value{})
	}
}