How Can I Pass Functions as Arguments in Go?

Passing Functions as Arguments: A Metaprogramming Approach in Golang

As we know, Golang functions are first-class values, eliminating the need for metaprogramming tricks common in dynamic languages. To pass a function as an argument to another function, we can simply utilize Golang's inherent support for function values. Here's an example:

package main

import "fmt"

func someFunction1(a, b int) int {
    return a + b
}

func someFunction2(a, b int) int {
    return a - b
}

func someOtherFunction(a, b int, f func(int, int) int) int {
    return f(a, b)
}

func main() {
    fmt.Println(someOtherFunction(111, 12, someFunction1))
    fmt.Println(someOtherFunction(111, 12, someFunction2))
}

Running this program will produce the following output:

123
99

Now, let's consider a scenario where the selection of the function depends on a run-time-only known value. To handle this, we can create a map that associates function names with their respective function pointers:

m := map[string]func(int, int) int{
    "someFunction1": someFunction1,
    "someFunction2": someFunction2,
}

...

z := someOtherFunction(x, y, m[key])

In this way, we can pass a function as an argument by its name, dynamically selecting the desired function at runtime.

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