Class: List

Inherits:
Object
  • Object
show all
Defined in:
lib/practica6/lista.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ List

Returns a new instance of List.



6
7
8
9
 
# File 'lib/practica6/lista.rb', line 6

def initialize
    @head = @tail = nil
    @contador=0
end

Instance Attribute Details

#head ⇒ Object

Returns the value of attribute head.



4
5
6
 
# File 'lib/practica6/lista.rb', line 4

def head
  @head
end

#prev ⇒ Object

Returns the value of attribute prev.



4
5
6
 
# File 'lib/practica6/lista.rb', line 4

def prev
  @prev
end

#tail ⇒ Object

Returns the value of attribute tail.



4
5
6
 
# File 'lib/practica6/lista.rb', line 4

def tail
  @tail
end

Instance Method Details

#add(value) ⇒ Object 



11
12
13
14
15
16
17
18
19
20
21
22
 
# File 'lib/practica6/lista.rb', line 11

def add(value)
    
    node = Node.new(value)

     @head = node if @head.nil?
    if(@tail!=nil)
        @tail.next = node 
        node.prev = @tail
        @contador=@contador+1
    end
    @tail = node
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


34
35
36
37
38
39
40
41
 
# File 'lib/practica6/lista.rb', line 34

def empty?
    
    if @head.nil?
        return true
    else 
        return false
    end
end

#ex_1er_elemento ⇒ Object 



23
24
25
26
27
28
29
30
31
32
 
# File 'lib/practica6/lista.rb', line 23

def ex_1er_elemento()
    if @head.nil?
       return false
    end
    
    @aux3=head
    
    @head = @head.next
    @aux3.next=nil
end

#extract_tail ⇒ Object 



43
44
45
46
47
48
49
50
51
52
53
54
55
 
# File 'lib/practica6/lista.rb', line 43

def extract_tail()
    
    aux=""
    if(@tail == nil)
        return false
    else
        aux = @tail.value
        @tail = @tail.prev
        return aux
    end
    
    
end

#to_s ⇒ Object 



56
57
58
59
60
61
62
63
64
65
66
67
 
# File 'lib/practica6/lista.rb', line 56

def to_s
    @aux=head
    aux2=""
    
    while @aux != nil do

        aux2 += "#{@aux.value.to_s}"
        
        @aux=@aux.next
    end
    "#{aux2}"
end