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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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descriptions says "Given non-empty array" -> no need to check for empty array.
oh indeed :D you are right
In the kata description it's stated that the array is "non-empty". That means that there's always something in the array, thus the array lenght cannot be zero.
it's will return of variable sum = 1
What happen if the lebgth of the array is zero ?
What happen if the lebgth of the array is zero ?
if the array length is zero your code provide 1 as solution
What if x.length == 0 ?