What is the method set of `sync.WaitGroup`?

Question

I have this simple program below

package main

import (
    \"fmt\"
    \"sync\"
    \"time\"
)

var wg sync.WaitGroup

func main() {
    wg.Add(1)

    go f         


        

Answer 1

In your case you are modifying a global wg object, if you pass it to a function you have to use pointer because you need to modify the object itself. If you pass by value, inside your function you will be modifying a copy of it, not the object itself.