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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.
you also shouldnt use var in general anymore with ES6 instead use let or const
"s4" is perhaps a bit missleading as it isn't really a string.
It's a very bad practise to use variable without the "var" keyword, because it's polluting the global scope.