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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've been learning JS for two months and it took me more than 8 hours for find the right solution. I feel kind of stupid because my solution has 75 Lines and some other solutions I see here are very short.
Is this normal or am I really to bad for this?
Very good, but, why do you need three zeros in the array "bills"? It is also working with just two of them. Or not?