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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
A lot of the solutions (js at least) seem to start the count at -1.
I think that's logically incorrect - even though it passes the tests.
The ball will always pass the window at least once, so I stared at 1, and then just didn't count the last do while loop, where the ball is actually not higher than the window.