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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.
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Create a simple calculator that given a string of operators (), +, -, *, / and numbers separated by spaces returns the value of that expression
I think , there is no test case for () usage in javascript at least.