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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.
how is this unreadable? It makes it so much clearer than, e.g., the kata description.
read about prototype.
by prototype you can add a property or a function to an object classes.
string.toUpperCase() is a prototpe function on string class
spoiler alert!
This comment is hidden because it contains spoiler information about the solution
Initial solution code gives a hint how to do this. Did you see how solution setup looks and do you know what it means?