이름으로 함수 호출하기

package main

import "fmt"
import "reflect"
import "errors"

func foo() {
    fmt.Println("we are running foo")
}

func bar(a, b, c int) {
    fmt.Println("we are running bar", a, b, c)
}

func ret() (bool, int) {
    return true, 100
}

func Call(m map[string]interface{}, name string, params ... interface{}) (result []reflect.Value, err error) {
    f := reflect.ValueOf(m[name])
    if len(params) != f.Type().NumIn() {
        err = errors.New("The number of params is not adapted.")
        return
    }
    in := make([]reflect.Value, len(params))
    for k, param := range params {
        in[k] = reflect.ValueOf(param)
    }
    result = f.Call(in)
    return
}

func main() {
    // nota bene: for perfect score: use reflection to build this map
    funcs := map[string]interface{} {
            "foo": foo,
            "bar": bar,
            "ret": ret,
    }

    Call(funcs, "foo")
    Call(funcs, "bar", 1, 2, 3)
    r, _ := Call(funcs, "ret")

    rBool := r[0].Interface().(bool)
    rInt := r[1].Interface().(int)

    fmt.Println("we are running ret", rBool, rInt)
}

https://play.golang.org/p/U1e44xi3pqz