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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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JS: users can modify the input (object).
JS: Node v12 should be used enabled along with its appropiate assertion tools (Mocha + Chai).
JS: No sample tests
Note that you did not provide any initial values, which is generally a bad idea if you're really about functional programming.
Needs random tests
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Please consider clarifying what to return when the 'pattern' is undefined in Javascript. It's not described in the description, so users have to blindly run test code to figure out a 'null' is required.
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