How to have a global variable accessible across all packages in Go?

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.RunTLS(":9000" , "domain.crt" , "domain.key") } In router.InitMap I want to declare a global variable which can be accessed throughout my application anywhere. Is is possible? I tried: func InitApp() (*gin.Engine,string) { var Global= "myvalue" router := gin.New() return router,Global } But I can't access the variable Global even in the same package.

Gopher · Accepted Answer

declare a variable at the top level - outside of any functions: var Global = "myvalue" func InitApp() (string) { var Global= "myvalue" return Global } Since the name of the variable starts with an uppercase letter, the variable will be available both in the current package through its name - and in any other package when you import the package defining the variable and qualify it with the package name as in: return packagename.Global. Here's another illustration (also in the Go playground):

Go Language

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