M000056.html in facets-0.7.2

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-  <title>last_index (Array)</title>
+  <title>shuffle! (Array)</title>
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-  <pre><span class="ruby-comment cmt"># File lib/facet/array/last_index.rb, line 10</span>
-  <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">last_index</span>
-    <span class="ruby-keyword kw">return</span> <span class="ruby-keyword kw">nil</span> <span class="ruby-keyword kw">if</span> <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">length</span> <span class="ruby-operator">==</span> <span class="ruby-value">0</span>
-    <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">length</span> <span class="ruby-operator">-</span> <span class="ruby-value">1</span>
+  <pre><span class="ruby-comment cmt"># File lib/facet/array/shuffle%21.rb, line 17</span>
+  <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">shuffle!</span>
+    <span class="ruby-identifier">s</span> = <span class="ruby-identifier">size</span>
+    <span class="ruby-identifier">each_index</span> <span class="ruby-keyword kw">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">j</span><span class="ruby-operator">|</span>
+      <span class="ruby-identifier">i</span> = <span class="ruby-constant">Kernel</span>.<span class="ruby-identifier">rand</span>(<span class="ruby-identifier">s</span><span class="ruby-operator">-</span><span class="ruby-identifier">j</span>)
+      <span class="ruby-comment cmt">#self[j], self[j+i] = self[j+i], self[j]</span>
+      <span class="ruby-identifier">tmp</span> = <span class="ruby-keyword kw">self</span>[<span class="ruby-identifier">j</span>]
+      <span class="ruby-keyword kw">self</span>[<span class="ruby-identifier">j</span>] = <span class="ruby-keyword kw">self</span>[<span class="ruby-identifier">j</span><span class="ruby-operator">+</span><span class="ruby-identifier">i</span>]
+      <span class="ruby-keyword kw">self</span>[<span class="ruby-identifier">j</span><span class="ruby-operator">+</span><span class="ruby-identifier">i</span>] = <span class="ruby-identifier">tmp</span>
+    <span class="ruby-keyword kw">end</span>
+    <span class="ruby-keyword kw">self</span>
   <span class="ruby-keyword kw">end</span></pre>
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