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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.
closure and being able to return functions is the basic building block of functional composition and other functional programing concepts.
You would use the always itself to establish a concept called immutability, which has implications in code organization by makgin easier to reuse constants as well as memory management.
A later concepts you may encouter is currying.
I am wondering the exact same thing. Anyone?