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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.
Can somebody explain, why add_() should returns undefined when add() returns NaN?
looks nice, but regexps adds magic in simple code)
Thanks, but I think topmost solution is a bit cleaner
Why do you preffer while loops?