Ah, that's counter intuitive. I thought Kyu were points that accumulate. Thanks for clarifying.

When the kyu number gets lower, the problems get harder. Compare your kyu rating with those of the people on the leader board.

This Kata is probably not worth 8 kyu - maybe 2 or 3 at most.

I committed an equally wrong solution just to see whether it works. I assume/hope some of these warriors were just trying the same thing.

There should be a way to down vote this one.

Fail if index == items.length

Amazing, this is wrong and gets three upvotes for best practices??? Can we downvote solutions?

Yes, you're right, it's a classic off-by-one error.

The testcases are not picking it up, though.

I believe this solution returns the wrong result:

items = ['a','b','c']
solution(items,3,'d')
=> nil

but should be 'd'

The & isn't necessary in your inject method. Otherwise, great work :)