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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.
Great use of the double tilde operator.
Nevermind, I found the bug. However, I'd like to point out there's no pre-submission test case for multiple operators. How about adding one? For example:
Test.assert_equals(calc("1 2 3 * +"), 7, "Should support multiple operators")
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This comment is hidden because it contains spoiler information about the solution