Awesome job on this one man. There's one thing you can improve:

I'm not sure which code I'm supposed to be looking at. My suggestions are to remove the files that don't need to be here (makes the repo much cleaner) or rename the files that I need to look at to appropriate names 👌

1. If you're only using one loop or block, then you're only iterating through the array once. That won't produce a sorted array.
2. The number of block variables that you pass through the pipe, should be equal to the number of variables (or objects) that need to be yielded.
3. A clue of what needs to be yielded lies with what's being passed through the block variable; what are the functions of the left and right variables?
4. What are the y and z variables? You're using them but they're nil objects.

You're on the right path. Keep up the good work, duderino.

Once again, you've done an awesome job, but you can also reduce the nested if-statements.