CodingBat lastItem

lastItem

Define a function that when passed an ArrayList, returns the last item if any. Return null if the list is null or empty. IMPORTANT: Because we are returning null, the return type is Integer, not int.

lastItem([10, 70, 20, 90]) → 90
lastItem([20, 20, 40]) → 40
lastItem([50]) → 50

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