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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.
I think replace is better anyways. Don't need to worry about getting null returned, then have to check for it. null.length doesn't brake your code, because you where not turned a string or array.
Awww that Number to return 0 on a falsy value! Excellent idea.