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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.
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If array is big and obj is unique, this will become quite slow.
Fair point (:
Don't know if the description updated, but it at least returns a falsy value.
Doesn't this not handle the case of phoneNumber property missing and returning false in this case?
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ok that's really a good one. I dont know how readable it is but it's as compact as hell.