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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.
Hi, while I was writing the solution I took it for granted but when you asked the question it made me search for why it works, here is a link expalinaing why it works for ruby 1.9+.
https://stackoverflow.com/questions/17355316/hash-ordering-preserved-between-iterations-if-not-modified
I personnaly prefer map/reduce because its how I learned the concept, from big data map/reduce
Can some one put an example to the problem, I don't understand