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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.
Great Kata!
Just a note for the description, when it states: "In the example above, keys is "1", "2" and "3", we can't see the quotes because console.log() doesn't show it."
It should read "In the example above, keys are "0", "1", "2"..."
Thanks for the informative katas! Been going through each one in your series.