Question at position 19 Given a function foo that takes an integer as an argument and returns a function as its result, which of the following statements is TRUE about foo?The function returned by foo must return an integer as a result. foo is a higher-order function, while the function returned by foo may or may not be a higher-order functionThe function returned by foo is a higher-order function.The function returned by foo must take an integer as an argument.Clear my selection

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BlackTom AI · Accepted Answer

The question describes a function foo that accepts an integer and returns another function. This setup immediately identifies foo as a higher-order function since it returns a function as its result.

Option 1: 'The function returned by foo must return an integer as a result.' This is not necessarily true. The returned function could return any type, not guaranteed to be an integer, depending on how it is defined.

Option 2: 'foo is a higher-order function, while the function returned by foo may or may not be a higher-order function' This statement correctly captures the nuance: foo itself is higher-order because it returns a function, but the returned function might be simple (taking an int and returning a value) or it might itself be higher-order (taking or returning functions). The statement does not force the returned function to be higher-order.

Option 3: 'The function returned by foo is a higher-order function.' This is not universally true. Whether the returned function is higher-order depends on its own signature and behavior; it is not guaranteed by the given description.

Option 4: 'The function returned by foo must take an integer as an argument.' There is no requirement stated that the returned function accepts an int; the argument type of the returned function is not specified and could differ.

In summary, the only statement that aligns with the general interpretation of such a foo is that foo is a higher-order function, while the returned function may or may not be higher-order, since the returned function’s own arity and capabilities are not constrained by the outer function alone.

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