reflect_func.go

package main

import (
	"fmt"
	"reflect"
)

func wrapFunction(inputFunc interface{}) interface{} {
	funcType, funcValue := reflect.TypeOf(inputFunc), reflect.ValueOf(inputFunc)

	wrapper := reflect.MakeFunc(funcType, func(input []reflect.Value) []reflect.Value {
		fmt.Println("<<<<<Start wrapping input function>>>>>")
		functionResult := funcValue.Call(input)
		fmt.Println("<<<<<Wrapp ended>>>>>")
		return functionResult
	})

	return wrapper.Interface()
}

func greet(value string) string {
	fmt.Println("Inside the greet function")
	return "Hello, " + value
}

func helloWorld() {
	fmt.Println("Hello, World!")
}

func main() {
	wrappedGreet := wrapFunction(greet).(func(string) string)
	fmt.Println("Value of wrappedGreet(): ", wrappedGreet("Jane Doe"))

	fmt.Println("-----------------------------------")
	wrappedHello := wrapFunction(helloWorld).(func())
	wrappedHello()
}