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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.
This was a quick example. In ES6, you can (and should) actually throw an object that accuratly describes your exception. This reading has some leads I advise everyone to follow on the subject: http://stackoverflow.com/questions/38145977/how-to-throw-invalidargumentexception-javascript
Yes... I changed it for surtich...