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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.
why not use var ? var is function specific and here he declared it in a function, kindly clarify
How is this working for every space when it is not replaceAll()