How to have a global variable accessible across all packages

Question

I have a main.go file which has:

// running the router in port 9000
func main() {
    router,Global := routers.InitApp()
    fmt.println(Global)
    router.RunTL         


        

Answer 1

It is better to use the init function for initialisation of global variables. It also will be processed only once even in multiply includes of this package. https://play.golang.org/p/0PJuXvWRoSr

package main

import (
        "fmt"
)

var Global string 

func init() { 
        Global = InitApp()
}

func main() {
    fmt.Println(Global)
}

func InitApp() (string) {
        return "myvalue"
}