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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.
It is language dependent, things like nill, undefined, etc. As JS can basically do odd things, there really are no invalids, hence you strip all falsy, only in JS.
Help us help you. At the very least tell us what language you're having this issue with. Preferably include the relevant literal text of the message.
Closing.
Approved