I feel like this really depends on how the question is asked, how the interviewee is guided through the question, and the interviewer's expectations. If I was the interviewer, this would basically be a fizzbuzz question. The reason is that I'm pretty sure I'd have to basically tell the interviewee that I want a higher order function that takes in a predicate function.
If the question is simply phrased, "Group the values by odds and evens ...; and please create an appropriate abstraction" without any more details, it would explain your results. I wouldn't be able to hold it against the interviewee that they couldn't reach the proper abstraction without more context.
If I wanted to gauge an interviewee's ability with abstraction and code organization, my preference would probably be to engage in a higher level discussion, because it's difficult to construct a code test that tests this well.
If the question is simply phrased, "Group the values by odds and evens ...; and please create an appropriate abstraction" without any more details, it would explain your results. I wouldn't be able to hold it against the interviewee that they couldn't reach the proper abstraction without more context.
If I wanted to gauge an interviewee's ability with abstraction and code organization, my preference would probably be to engage in a higher level discussion, because it's difficult to construct a code test that tests this well.