How to create a map of functions (function registry) in Go?

In Go, you can create a map of functions by using the map data structure and assigning function values to its keys. Here's an example of how you can create a function registry in Go:

package main

import "fmt"

// Function signature for the functions stored in the registry
type FuncType func(string) string

// Registry to store functions
var funcRegistry map[string]FuncType

// Register a function in the registry
func RegisterFunc(name string, fn FuncType) {
    funcRegistry[name] = fn
}

// Function 1 to be registered
func Function1(input string) string {
    return "Function 1: " + input
}

// Function 2 to be registered
func Function2(input string) string {
    return "Function 2: " + input
}

// Main function
func main() {
    // Initialize the registry
    funcRegistry = make(map[string]FuncType)

    // Register functions in the registry
    RegisterFunc("function1", Function1)
    RegisterFunc("function2", Function2)

    // Call a function from the registry
    result1 := funcRegistry["function1"]("Hello")
    fmt.Println(result1)

    result2 := funcRegistry["function2"]("World")
    fmt.Println(result2)
}

In this example, we define a FuncType type to represent the function signature. We create a funcRegistry variable of type map[string]FuncType to store our functions. The RegisterFunc function allows us to add new functions to the registry by providing a name and the function itself. Finally, we can use the registered functions by accessing them from the funcRegistry map.

Running this code will output:

Function 1: Hello
Function 2: World

Note that the code provided is a simple example to demonstrate the concept. In practical scenarios, you may want to add error handling, function validation, or additional functionality to suit your specific needs.