How Can I Store Functions as Values in a Go Map?

Storing Functions in a Go Map

In Go, a map is a type that stores key-value pairs. Keys and values can be of any type. In your case, you want to store functions in a map. However, your code doesn't work because a function type cannot be used as a key in a map.

To work around this, you can use an interface type to represent a function. An interface type defines a set of methods that a type must implement to satisfy the interface. In this case, you can create an interface type that represents a function that takes a string as a parameter.

import "fmt"

// A function type that takes a string as a parameter.
type StringFunc func(string)

// A map that stores functions that take a string as a parameter.
var funcs map[string]StringFunc

// A function that takes a string as a parameter.
func a(p string) {
    fmt.Println("function a parameter:", p)
}

// Main function.
func main() {
    // Create a map that stores functions that take a string as a parameter.
    funcs = make(map[string]StringFunc)

    // Add the 'a' function to the map.
    funcs["a"] = a

    // Call the 'a' function from the map.
    funcs["a"]("hello")
}

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