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<title>class Alimento::Lista - RDoc Documentation</title>
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<li ><a href="#method-i-extraer_tail">#extraer_tail</a>
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<h1 id="class-Alimento::Lista" class="class">
class Alimento::Lista
</h1>
<section class="description">
<p>Esta clase es la definición de una lista doblemente enlazada.</p>
</section>
<section id="5Buntitled-5D" class="documentation-section">
<section class="attribute-method-details" class="method-section">
<header>
<h3>Attributes</h3>
</header>
<div id="attribute-i-head" class="method-detail">
<div class="method-heading attribute-method-heading">
<span class="method-name">head</span><span
class="attribute-access-type">[R]</span>
</div>
<div class="method-description">
</div>
</div>
<div id="attribute-i-tail" class="method-detail">
<div class="method-heading attribute-method-heading">
<span class="method-name">tail</span><span
class="attribute-access-type">[R]</span>
</div>
<div class="method-description">
</div>
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</section>
<section id="public-class-5Buntitled-5D-method-details" class="method-section">
<header>
<h3>Public Class Methods</h3>
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<div id="method-c-new" class="method-detail ">
<div class="method-heading">
<span class="method-name">new</span><span
class="method-args">()</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>Inicia la lista (vacía).</p>
<div class="method-source-code" id="new-source">
<pre><span class="ruby-comment"># File lib/alimento/lista.rb, line 13</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">initialize</span>
<span class="ruby-ivar">@head</span> = <span class="ruby-keyword">nil</span>
<span class="ruby-ivar">@tail</span> = <span class="ruby-keyword">nil</span>
<span class="ruby-keyword">end</span></pre>
</div>
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</section>
<section id="public-instance-5Buntitled-5D-method-details" class="method-section">
<header>
<h3>Public Instance Methods</h3>
</header>
<div id="method-i-each" class="method-detail ">
<div class="method-heading">
<span class="method-name">each</span><span
class="method-args">() { |valor| ... }</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>Se incluye el metodo del mixin Enumerable. Iteración sobre los elementos
de la lista desde el principio hasta el final.</p>
<div class="method-source-code" id="each-source">
<pre><span class="ruby-comment"># File lib/alimento/lista.rb, line 60</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">each</span>
<span class="ruby-identifier">iterador</span> = <span class="ruby-ivar">@head</span>
<span class="ruby-keyword">while</span> <span class="ruby-identifier">iterador</span> <span class="ruby-operator">!=</span> <span class="ruby-keyword">nil</span>
<span class="ruby-keyword">yield</span> <span class="ruby-identifier">iterador</span>.<span class="ruby-identifier">valor</span>
<span class="ruby-identifier">iterador</span> = <span class="ruby-identifier">iterador</span>.<span class="ruby-identifier">siguiente</span>
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
<div id="method-i-extraer_head" class="method-detail ">
<div class="method-heading">
<span class="method-name">extraer_head</span><span
class="method-args">()</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>Elimina el primer elemento de la lista.</p>
<div class="method-source-code" id="extraer_head-source">
<pre><span class="ruby-comment"># File lib/alimento/lista.rb, line 49</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">extraer_head</span>
<span class="ruby-ivar">@head</span> = <span class="ruby-ivar">@head</span>.<span class="ruby-identifier">siguiente</span>
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
<div id="method-i-extraer_tail" class="method-detail ">
<div class="method-heading">
<span class="method-name">extraer_tail</span><span
class="method-args">()</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>Elimina el último elemento de la lista.</p>
<div class="method-source-code" id="extraer_tail-source">
<pre><span class="ruby-comment"># File lib/alimento/lista.rb, line 54</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">extraer_tail</span>
<span class="ruby-ivar">@tail</span> = <span class="ruby-ivar">@tail</span>.<span class="ruby-identifier">anterior</span>
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
<div id="method-i-insertar_head" class="method-detail ">
<div class="method-heading">
<span class="method-name">insertar_head</span><span
class="method-args">(valor)</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>Permite insertar un valor en la lista por delante.</p>
<div class="method-source-code" id="insertar_head-source">
<pre><span class="ruby-comment"># File lib/alimento/lista.rb, line 19</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">insertar_head</span>(<span class="ruby-identifier">valor</span>)
<span class="ruby-identifier">nodo</span> = <span class="ruby-constant">Nodo</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">valor</span>,<span class="ruby-keyword">nil</span>,<span class="ruby-keyword">nil</span>)
<span class="ruby-keyword">if</span> (<span class="ruby-ivar">@head</span> <span class="ruby-operator">==</span> <span class="ruby-keyword">nil</span>)
<span class="ruby-ivar">@head</span> = <span class="ruby-identifier">nodo</span>
<span class="ruby-ivar">@tail</span> = <span class="ruby-identifier">nodo</span>
<span class="ruby-keyword">else</span>
<span class="ruby-ivar">@head</span>.<span class="ruby-identifier">anterior</span> = <span class="ruby-identifier">nodo</span>
<span class="ruby-identifier">nodo</span>.<span class="ruby-identifier">siguiente</span> = <span class="ruby-ivar">@head</span>
<span class="ruby-ivar">@head</span> = <span class="ruby-identifier">nodo</span>
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
<div id="method-i-insertar_tail" class="method-detail ">
<div class="method-heading">
<span class="method-name">insertar_tail</span><span
class="method-args">(valor)</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>Permite insertar un valor en la lista por detrás.</p>
<div class="method-source-code" id="insertar_tail-source">
<pre><span class="ruby-comment"># File lib/alimento/lista.rb, line 34</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">insertar_tail</span>(<span class="ruby-identifier">valor</span>)
<span class="ruby-identifier">nodo</span> = <span class="ruby-constant">Nodo</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">valor</span>,<span class="ruby-keyword">nil</span>,<span class="ruby-keyword">nil</span>)
<span class="ruby-keyword">if</span> (<span class="ruby-ivar">@tail</span> <span class="ruby-operator">==</span> <span class="ruby-keyword">nil</span>)
<span class="ruby-ivar">@tail</span> = <span class="ruby-identifier">nodo</span>
<span class="ruby-ivar">@head</span> = <span class="ruby-identifier">nodo</span>
<span class="ruby-keyword">else</span>
<span class="ruby-ivar">@tail</span>.<span class="ruby-identifier">siguiente</span> = <span class="ruby-identifier">nodo</span>
<span class="ruby-identifier">nodo</span>.<span class="ruby-identifier">anterior</span> = <span class="ruby-ivar">@tail</span>
<span class="ruby-ivar">@tail</span> = <span class="ruby-identifier">nodo</span>
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
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