Append

Using the append command/method, we can add an element to the end of the table which in turn returns a reference to the current BookList object.The deleteFirst and deleteLast command allows us to delete the first and last records respectively in the following form/s:

For Append:
class BookList
def append(aBook)
@books.push(aBook)
self
end
end

For deleteFirst and deleteLast

class BookList
def deleteFirts
@books.shift
end
def deleteLast
@books.pop
end
end

Now we test the code we have just created to show if the right operations are being performed and if we are getting the results we desire:

list = BookList.new
list.
append(Books.new(‘ABCD’, ‘Author1′,1)).
append(Books.new(‘EFGH’, ‘Author2′,2)).
append(Books.new(‘IJKL’, ‘Author3′,3)).
append(Books.new(‘MNOP’, ‘Author4′,4))

In the next posts, we get to check and simplify the code we have just executed.