Scala List Methods

Define list as
     >val l=List(9,8,89,900)
to get first element
    > l.head
to get elements except first
    >l.tail
to get lat element
    >l.last
to get length
    >l.length
to get n'th element(n:Int)
    >l(n)
to append 2 lists 'l' and 'k'
    >l++k
to get difference(display the elements in 'l' not in 'k')
    >l.diff(k)
to drop n elements (n:Int)
    > l.drop(n)
drop n elements from right
    > l.dropRight(2)