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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.
// my comment here
Using fold would be better
You could have used the rest parameter in your function, declare a [r,g,b] array was unnecessary
I used 1001 as "first last", but i used the same logic
Almost my answer, but...
return !parens.lenght