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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.
if still facing difficulty search Dave Gray on youtube to understand "prototypical" inheritance in js.
And read about "this" keyword.
Not a kata issue. You must implement a
String.prototype
, read the documentation about prototypes if you don't know how to do it.