Your question is Async Closure Output. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
What does this print out? var arr = [1, 2, 3]; for (var i = 0; i < arr.length; i++) setTimeout(()=>console.log(arr[i]), 1000)