Loading collection data...
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.
That makes sense now. Thanks for the tip. I just solved it.
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See my reply to @jeffersonsnow
You are modifying the source array. You should leave it intact, instead the method should return a new array instance without specified keys. Because you modify the source array, the array passed to further tests has less elements than it should have had.
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