Go map of functions

Issue

I have Go program that has a function defined. I also have a map that should have a key for each function. How can I do that?

I have tried this, but this doesn’t work.

func a(param string) {

}

m := map[string] func {
    'a_func': a,
}

for key, value := range m {
   if key == 'a_func' {
    value(param) 
   }
}

Solution

Are you trying to do something like this? I’ve revised the example to use varying types and numbers of function parameters.

package main

import "fmt"

func f(p string) {
    fmt.Println("function f parameter:", p)
}

func g(p string, q int) {
    fmt.Println("function g parameters:", p, q)
}

func main() {
    m := map[string]interface{}{
        "f": f,
        "g": g,
    }
    for k, v := range m {
        switch k {
        case "f":
            v.(func(string))("astring")
        case "g":
            v.(func(string, int))("astring", 42)
        }
    }
}

Answered By – peterSO

Answer Checked By – Dawn Plyler (GoLangFix Volunteer)

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