Loading collection data...
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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Not at all! It's a really bad practice iterate the same array twice. If a person who's starting with Javascript see this, it won't understand at all.
Very nice and clean!
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Since this is TypeScript, this checking is unnecessary. You cannot feed it non-string values, since the argument is of type string.