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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.
the test has limited cases. when you attempt, it runs more number of different cases than during initial test. Probably it is showing an error in cases when array2 or array1 are null or None. what to do in these cases has been specified in instruction
Unfortunately you are wrong. Look at the top of the page: 13404 people passed the JS kata. If there were errors somebody would have seen them before. Cheers.