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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.
There's no point in a kata which asks you to concatenate 2 strings or call a built-in function on the input. Such requirements are already present in multiple approved katas, and have no practical value as separate tasks.
What's the desired precision in JS?