kind of haskell function

In ML, define a function listsquare that when applied to the empty list of integers returns the empty list, and when applied to a non-empty list of integers return a list where each element is squared. For example, listsquares [2, 3, 4] returns [4, 9, 16]. Deine the function using a let expression in ML. val testList = [1, 2, 3, 4, 5] val testResults = listsquare testList