How to Return Nil String in Go?

Question

I have a function which returns a string under certain circumstances, namely when the program runs in Linux or MacOS, otherwise the return value should be nil in order to omit s

Answer 1

Go has built-in support for multiple return values:

This feature is used often in idiomatic Go, for example to return both result and error values from a function.

In your case it could be like this:

func test() (response string, err error) {
    if runtime.GOOS != "linux" {  
        return "", nil
    } else {
        /* blablabla*/
    }
}

And then:

response, err := test()
if err != nil { 
    // Error handling code
    return;
}

// Normal code 

If you want to ignore the error, simply use _:

response, _ := test()
// Normal code