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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.
There is a problem with the test for SQL kata. The sequence in the kata description start from 0 but in the test (expected results) starts from 1.
So in the description is P(0)=P(1)=P(2)=1
but the expected result is P(1)=P(2)=P(3)=1
wtf?
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Functional programming is cool