Method: Returns this option if non-empty, or the passed option otherwise.

Method: This is similar to map() below except that the return value has no meaning; the passed callable is simply executed if the option is non-empty, and ignored if the option is empty.

Method: This is similar to map() except that the return value of the callable has no meaning.

Method: Applies the callable to the value of the option if it is non-empty, and returns the return value of the callable wrapped in Some().

Method: Applies the callable to the value of the option if it is non-empty, and returns the return value of the callable directly.