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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.
for..of loop, you mean - a for..in loop on a string will iterate over the indeces; a for..of loop will iterate over the characters.
point is the length test shouldn't be on the passed string, but on the final hash-tagged string.