Global variable private to file

Question

In GOLANG, Is there a way to make a variable's scope local to a file within a package? In my case, there are 2 files ex1.go and ex02.go. ex01.go defines a global variable

var wg sync.WaitGroup 

which is used across functions in that file.

In another file ex02.go (which has no relation with ex01.go except that both ex01.go and ex02.go belong to the same class of problems - i.e. concurrency), I can't define a variable for waitGroup as

var wg sync.WaitGroup 

I get an error - "variable name is re-declared in this block"

Is there a way to keep the variable names from spilling over to the other files?

Answer 1

For the purpose of variable scoping, files have no meaning in Go. Think of all files in a package as if they would be concatenated, which (simplified) is exactly what happens before compilation.

That means: No, there is no way of scoping a variable to a file.

If you need two global WaitGroups, you need to define them as individual variables.