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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.
Needs more fixed tests on top of the random tests @FArekkusu mentioned.
No random tests.
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Use spoiler tag, otherwise your very detailed comment is plainly visible in the homepage.
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You use the correct comparison with typeof x === 'number' - nice. The clarity of your code is good, although a little verbose. Instead of a for loop you could use Array.filter (see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter)
Thanks for spotting that! Added the sample tests in.
Missing sample tests.