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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 must also aware of how in operator works because it is not only work on its parent object it is also works on object prototype chaining so let's say that property name already exists in object prototype then it will generate bug to your code
Are you sure? Random tests have been added to Scala translation a couple of hours ago.