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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.
Yes, I did exactly what you say ,But in a more stupid way
Prototypes is workly so fast and so optimised in JS. Let go of your prejudices and explore what prototype programming is (Not only in JS).