The answers are over complicating things though. There are built in libraries that make it trivial to do this. A waitgroup is relatively low level and gives you

The answers are over complicating things though. There are built in libraries that make it trivial to do this. A waitgroup is relatively low level and gives you the function you can call in your defer to signal completion. An errgroup builds on the waitgroup and gives you start & wait primitives, similar to the nursery discussed in the HN post.