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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.
Ah, I could have simplified my solution. Oh, well.
This comment is hidden because it contains spoiler information about the solution
thanks! i simply forgot about it
It is not specified that
haystackdoes not containsnull's. In case ofnullString#valueOfwill throw aNullPointerException. Pretty elegant solution though!