There's an idea I've been made aware of called undesirable difficulty in learning theory. The idea is that sometimes obstacles are put in place that take the focus off learning a specific thing by introducing a challenge on a thing that might be related but not critical to the task at hand.
In this exercise, I notice pretty much everyone reaches for the splice method and I suspect it is because of the language in the prompt. Specifically: "removes the other arguments from that array"
I've added a hint that I think would not take away from the challenge but give learners an alternative way to think about the exercise.
Carlos Diaz
thatblindgeye
Briggs Elsperger
Benjo Kho