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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.
Same, even with @rowcased's comment I'm not seeing the solution.
the instructions do say:
Should the last donation be a non positive number (<= 0) John wants us to throw (or raise) an error
Same, instructions are not specifict as to what should be returned in JS