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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.
Also arrow functions context differ from regular function expressions and declerations. They follow Lexical scope. I recomend reasearching this difference and when it is better to use an arrow funciton over other ways of writing it. It makes a difference when using the 'this' key word.
the most common use is just to make things shorter. Arrow functions automatically return without specifying 'return' if the function is on one line.