Is it possible to pass a function as a value in a map data structure?

Yes, in Go, functions can be passed as values in data structures like map, since functions are first-class citizens.

Example:

package main

import "fmt"

func main() {
    // Declare a map with string keys and function values that take an int and return an int
    funcMap := make(map[string]func(int) int)

    // Add functions to the map
    funcMap["square"] = func(x int) int { return x * x }
    funcMap["double"] = func(x int) int { return x * 2 }

    // Use functions from the map
    fmt.Println(funcMap["square"](5)) // 25
    fmt.Println(funcMap["double"](5)) // 10
}

Thus, you can store and call functions from a map by key.