How Can I Call a Go Function Using Its Name (String) at Runtime?

Pointer to Function from String in Go

Metaprogramming, or the ability to manipulate code itself at runtime, is a powerful technique in programming. In Go, one aspect that may arise is the need to access a pointer to a function based on its name, which is provided as a string.

Solution

Unlike dynamic languages, Go functions are considered first-class values. This means that functions can be passed as arguments to other functions, eliminating the need for complex metaprogramming techniques.

To demonstrate this, consider the following code snippet:

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))
}

Execution

When this code is executed, it will produce the following output:

123
99

This demonstrates how functions can be passed as arguments to someOtherFunction, based on their names.

Custom Function Selection

If the selection of the function depends on a value that is only known at runtime, you can use a map to associate function names with their corresponding function pointers:

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

...

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

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