You need to use it when you want to be negative of ALL the thing after unless. Basically, do_something unless A Then it's simple now to manipulate the inside

You need to use it when you want to be negative of ALL the thing after unless. Basically, do_something unless A Then it's simple now to manipulate the inside of A, as you only take care of the positive ! That's beautiful and simple design. Example is you want to validate something. raise Error unless someValidCondition. Now decompose someValidCondition by just using positive connectives, simple right ?