I hope this helps you: https://github.com/rubocop-hq/ruby-style-guide#if-vs-unless
Prefer unless over if for negative conditions (or control flow ||).
# bad do_something if !some_condition # bad do_something if not some_condition # good do_something unless some_condition
I personally agree with what’s written there choosing unless something over if !something for modifiers and simple ones and when there’s an else prefer if.