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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.
you are consistant
"In this kata you will create a function that takes a list of non-negative integers", that's the input.
My understanding is that it always give you "non-negative integers".
There's no such kind of requirement regarding the filter. In my reading it is a precondition.
"takes a list of non-negative integers"
there is nothing that says to filter out negative integers. It specifically says to filter out strings.