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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.
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I also had the same issue when i modified the input array. The expected value for the test was the one for the modified array.
input: [27, 47, 2, 87, 12], i modified the input by shifting the first element: [47, 2, 87, 12]
got: ['+0', '+20', '-25', '+60', '-15']
expected: ['+0', '-45', '+40', '-35']
Is this the normal behaviour, or should the tests be modified to take this into account?