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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.
I have the same problem, any clue?
It think that in the description should be clarified that the "functions" array should not be modified or the random test will fail (at least in JS). It took me a while to detect what was wrong with my code.
I think that should be clarified that the original vectors should no be modified in add and subtract methods.
I think that it is necessary to add a hint in the description, if not you don't know what to look for in case of you don't know how to solve the exercise.
You should find the square of each digit: 9119 >> 9-1-1-9 >> 81-1-1-81 >> 811181