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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.
The idea is amazing, I love it very much. but the code itself is a little weak. For example :("-3 - 1 * 2 + 2 - 7") have different result with ("-3 -1 * 2 + 2 - 7"). one purpose, two result.
I like your idea!