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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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Fix broken test cases or remove this kata.
You recreate array each time when f(c) returned true.
How to search not completed kata for one of my languages even if I completed it for another of my languages?
Added Array.from()
http://jsperf.com/what-is-the-best-range/4
In safari 'repetition' ~90% slower than 'while'
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And what about this?
last({}, { length: 'foo' }); //'foo' - 1? WTF?