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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.
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Handling floating point errors is probably outside the scope of a beginner kata.
Tests don't account for edge cases
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need default tests
You really need to decide can anybody use Math.random (disable it if not). Because solutions are ~7 kyu with Math.random and ~2 kyu without.