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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.
Arrow functions are not IIFE. This is just their syntax. If they are one line expressions they don't need return. But if they contain several lines of code, then they need return statement and curly braces around code block.
Array is an object, so strict equality won't evaluate as true.
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Javascript https://www.codewars.com/kumite/5b7e3f187a0c9d2e780000cd?sel=5b7e3f187a0c9d2e780000cd