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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.
Reactive programming is a complicated paradigm that has recently exploded in popularity. We need katas that focus on on honing reactive programming techniques. The ReactiveX API, for example, supports many languages, most notably JavaScript (RxJS), so these katas wouldn't be pinned down to just a single language.