https://www.youtube.com/shorts/VS2ZCCGYmpA

Your code only returns inside an if, if the condition is not met, then your function returns undefined and that's what you see.

won't let me return 0 keep saying undefined

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If an empty value ( null, None, Nothing etc. ) is given instead of an array, or the given array is an empty list or a list with only 1 element, return 0.