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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 calculator does not support expressions like "1 * (1 + 1)", as stated in the task description:
"Create a simple calculator that given a string of operators (), +, -, *, / and numbers separated by spaces returns the value of that expression"
This calculator supports expressions like "1 + 2 * (3 + 4) - 6 * (5 + (2 + 5))", as described in the kata description.
The vast majority of others are not...