That's the first "wait, what?". However, if you actually try and work out that horrible if statement !((_ok) ? true : (Math.random() > 0.1)) _ok ? fal

That's the first "wait, what?". However, if you actually try and work out that horrible if statement !((_ok) ? true : (Math.random() > 0.1)) _ok ? false : !(Math.random() > 0.1) !_ok && Math.random() <= 0.1 Seems fine...until you realise that this is the condition to exit early, it's still logging 90% of the time which is almost certainly not the desired behavior. Not to mention _ok is a terrible name for that variable, and it's only ever being used as a negation. Why isn't it called _error or something?