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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.
Something like this: array.map(el => el). No printing, just visiting each element and returning it.
I had some trouble with getting a 'TypeError: Cannot delete property 'x' of #', which was a product of changes to the return of deleting a property that is non-configurable in 'strict-mode', I changed to a non ES6 syntax and had success.
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