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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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You can omit accessing the element (with
[0]) of the array that is returned by the slice method. Less or equal condition coerces that array to a number (when there is not more than one element in an array, as in here).This comment is hidden because it contains spoiler information about the solution
Off-by-one error. The condition in the loop needs to be
i < letters.length - 1.It's always good to be consistent though.