Class: List

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/dieta/Lista.rb

Defined Under Namespace

Classes: Node

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(top) ⇒ List

Returns a new instance of List.



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# File 'lib/dieta/Lista.rb', line 6

def initialize(top)
   if top === nil
     @top = nil
     @last = nil
   else
      @top = Node.new(top,nil,nil)
      @last = Node.new(top,nil,nil)
   end
end

Instance Attribute Details

#last ⇒ Object

Returns the value of attribute last.



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# File 'lib/dieta/Lista.rb', line 3

def last
  @last
end

#top ⇒ Object

Returns the value of attribute top.



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# File 'lib/dieta/Lista.rb', line 3

def top
  @top
end

Instance Method Details

#empty ⇒ Object 



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# File 'lib/dieta/Lista.rb', line 65

def empty
  if @top == nil
     true
  else
     false
  end
end

#extraer ⇒ Object 



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# File 'lib/dieta/Lista.rb', line 46

def extraer
   if empty
      puts "Lista vacia. Empty!"
   else
       extraer = @top[:value]
       aux_to = @top[:prev]
       
       if @top == @last
         @last = nil;
       end
       
       aux_to[:next] = nil
       @top = aux_to
       
       extraer
   end
   
end

#insertar(elemento) ⇒ Object 



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# File 'lib/dieta/Lista.rb', line 20

def insertar(elemento)
   if empty
        @top = Node.new(elemento,nil, nil)
        @last =  Node.new(elemento,nil, nil)
   else
        @top[:next] = elemento;
        nmenu = Node.new(elemento, @top, nil)
        @top = nmenu
   end
end

#insertarMultiple(elementos) ⇒ Object 



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# File 'lib/dieta/Lista.rb', line 15

def insertarMultiple(elementos)
    elementos.each do |elemento|
           insertar(elemento)
    end
end

#mostrarUltimo ⇒ Object 



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# File 'lib/dieta/Lista.rb', line 31

def mostrarUltimo
   if empty
      puts "Lista vacia. Empty!"
   else
       aux = @top;
       while aux[:prev] != nil
          aux = aux[:prev]
       end
       
       aux[:value]
       
   end
   
end