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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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I have never seen this in the work place. Why would anyone wrap default behavior into a function that has a similar name? This just adds a layer of confusion, no offense. One-lining an arrow function is fine, but breaking it out is more legible when staring at a codebase.
Edit: commented without seeing the problem has function maps(x) defined
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