Reference to string literals in Go

Question

In my application I will frequently pass references to a static string. I wish to avoid having Go allocate memory for each call, but I failed to get the address to my string

Answer 1

I am using interface{} to indicate that my string will be sometimes nil. In my case it looks like:

testCases := []struct {
        Values map[string]interface{}
    }{
        {
            Values: map[string]interface{}{"var1": nil},
        },
        {
            Values: map[string]interface{}{"var1": "my_cool_string"},
        },
    }

And later in following code (You may also want the assertion check):

if v != nil {
    vv := v.(string)
}