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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.
what ... in beginning of array stands for?
I did string.match(/[a-z]/g) but it return just amount of letter this string contains(not amount of unique letters), why it wasnt working? Can anyone explain please