Yes.

My numbers are reaching infinity. Am I approaching the problem incorrectly?

Finding the LCA is a well known problem. This probably made most early-solvers vote kyu 6. If you want even more of a challenge, there's this kata waiting for you :)

This is a 6? How can this possibly be the in the third easiest out of 8?

We cannot help since you provide no information.

I got a weird error for the random tests but could not figure out why.

OK we get it you're great.

The point is this:

Note: Your function should modify the input rather than creating a new array.

Because you try to apply map to something that is null, and this is incorrect in (I guess) JavaScript.

Whenever I solve the test I get the error > TypeError: Cannot read property 'map' of null

Any idea why?

Thanks! I wouldn't be able to solve if I hadn't read your comment.

Really a 6?

This took me hours as I had to redo my code many times but it was a blast. Great kata!

It looks like this code times out now. Does anyone have any idea why?

Yea I would have to agree. This should be a 3 or 4 I feel.