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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.
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The difference is the first code won't reach
array[array.length]that'sundefinedbecause it'll return earlier. Also the second won't work for other reasons, but that's the main difference.The at() function is in Node versions 16.6.0 and above, which codewars doesn't have