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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.
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Thanks for your explanation a lot.
So, what you mean is that 'this' of vasya's method (if passed to the .every() just as vasya.sell) will be bound to the personInLine which, in return, will not have 'money' object inside causing an error?
If so, then I got it. But it took me some time.
Why do we need to bind vasya's method 'sell' to vasya?