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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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Floating point comparison should be enabled in Ruby
Description should be language-agnostic
Tests are broken in js with nested arrays in many cases, it seems like tests modify randomly the arguments in a bad way: for example, with an original array '[ 2, 3, [ 2, 10 ] ]', tests return "Wrong value for [2,3] - Expected: 2, instead got: 12".
Random tests:
Wrong value for [6,[3,5,[2,6],[[]],[]],[[8,[]],[],3,4],[1,[4,6,[8],9],1,4,2],[1,[[]],5,[],[[3,[2,[[]]],3],[],2,[3,10,5]]],3] - Expected: 9004099622918398000, instead got: 9004099622918401000There are still arrays with result outside the 53-bit safe integer range.
Test cases should be provided.
I think you need to include more/better test cases. Like randomizing both the Arrays and the number of arrays.
I also think you should put some example test cases. I can imagine for someone who's not dealt with it before that a variable number of arguments might not be obvious.