Produces a new list with head
as the head and this object as
the tail.
Produces the head of this list.
Produces the head of this list.
scala.None if the list has no head and Some x
if x
is the
head of the list.
Produces true
if this object represents an empty list.
Produces the tail of this list.
Produces the tail of this list.
scala.None if the list has no tail and Some x
if x
is the
tail of the list.