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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.
This is a bad calculator since there is no lexical analysis (input would be
"10 + 10"
). Try making it better and expand on it so it supports powers (**), lets you use more that one expression ("10 + 10 / 2
) WITH the order of calculation. Sure you can do some good things with it.