Finds the maximum value in the list.
Finds the maximum value in the list.
Finds the maximum value in the list.
Finds the maximum value in the list.
Finds the maximum value in the list.
Finds the maximum value in the list.
Finds the minimum value in the list.
Finds the minimum value in the list.
Finds the minimum value in the list.
Finds the minimum value in the list.
Finds the minimum value in the list.
Finds the minimum value in the list.
Sets the internal index so that the `next' object
can be returned.