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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.
Oh wow I just solved it. Thanks for your help, sir!
I am fine if you post your code here, as long as you mark it as a spoiler.
Without seeing your code, all I can say is that you need to make sure that none of the objects in the array already have that phoneNumber. Another way to think of it is that ALL of them don't have that number. Either way works, whichever one you can understand easier.
This comment is hidden because it contains spoiler information about the solution