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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 also fun :) And it is not that hard, actually, once you know a few tricks. While I admit it might have little practical sense at these extremes, playing with this technique may teach one how to to write shorter, nicer, easier to read (yes, I insist!) code.
And it also helps understand lambdified code of others.
Cool. Didn't know that. Thanks.