That's just another way of writing the same thing. It comes down to personal preference. Although, I would argue that since guard is specifically meant for returning early from a closure, which is what we're doing here, it makes more sense in this context than if.

Why would you use guard here? Can't we just write if (num < 3) { return 0 }?

Exactly what i was thinking. I first tried it like above, but it was throwing me an error. But i think mainly because i used "for i in 1..<num" and it was checking with 0.

I nested the whole thing in a "if num > 0 {...} else {return 0}" but mainly cause i'm not much familiar with guard. :D Thanks, gonna look into that again.