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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.
The
thiskey word refers to the object that changes what it refers to based on when it's invoked. In the example, it's referring to the string that.toJadenCaseis being called upon.It's a tricky concept starting out, MDN probably explains it much better than most of us could: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/this