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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 such an element is found, the every method immediately returns false. "
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/every
Nice syntax solution. But why you are using every() function. Isnt it more efficient to stop after the first matched negative value ?