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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.
This is the most elegant solution. It should be on top.
It is fix + refactoring
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This is not readable.
Fairly slow and memory consuming solution.
It is not a best practice.
That will throw NPE in case null element in the array.
LOL
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