i wonder why the author hasnt been active? maybe calling the work he contributes for free "pathetic" is self limiting?

Could you explain what's wrong with your solution so I can adjust the test cases?

I have updated the description text, is it clear enough now?

I have addressed the examples.

Added this test! Thanks @joshbrodienz!

I think you're just overthinking it. This implementation is overkill.

Updated.

Your test assertions are backwards. For instance,

should find the size of the small loop with a long tail:
Test Failed: Expected: 2, instead got: 23

should find the size of the huge loop with a short tail:
Test Failed: Expected: 3, instead got: 8778

Updated it! Any other thoughts?

How do you suggest I update it? That test was just to ensure that a block was saved in the EventEmitter and could be called.

I've updated the kata, can you re-review?

I have updated the description to specify using a lambda, can you please re-review?

I have updated the kata per your comments above. Can you take another look? I think its much clearer now, and have added back in the additional tests to make the solution more strict.