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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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Mutating variables while mapping over an array might be a little confusing. Nice 2 liner though!
Should map functions be pure? That's for the development team to decide...
I used a nested while loop instead. If I used 'continue', I could have avoided nesting and achieved better readability.
Love this use to spreading strings to arrays!