Two weeks ago José Valim created a Pull Request in the Phoenix project. One of the things that stood out to me when I was taking a look at it was this line.
Here, José is pattern matching to underscore the result value of the call to
Process.monitor/1, which at first looks like an unnecessary match, due to the fact that the result will be ignored.
The full function block looks something like this:
As he explains:
Yes, we usually do it to say “i know this returns something meaningful, but i am sure i don’t need it”.
This seems to be a good convention to show we won’t use the returned expression, so I will take it into account to use it in the future.