M000481.html in facets-0.7.2

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      PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
      "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
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-  <title>prod (Lisp)</title>
+  <title>filter (Lisp)</title>
   <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
   <link rel="stylesheet" href="../.././rdoc-style.css" type="text/css" media="screen" />
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-  <pre><span class="ruby-comment cmt"># File lib/facet/lisp.rb, line 326</span>
-  <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">prod</span>(<span class="ruby-identifier">list</span>)
-    <span class="ruby-identifier">accumulate</span>(<span class="ruby-identifier">lambda</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">x</span>, <span class="ruby-identifier">y</span><span class="ruby-operator">|</span> <span class="ruby-identifier">x</span> <span class="ruby-operator">*</span> <span class="ruby-identifier">y</span> }, <span class="ruby-value">1</span>, <span class="ruby-identifier">list</span>)
+  <pre><span class="ruby-comment cmt"># File lib/facet/lisp.rb, line 249</span>
+  <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">filter</span>(<span class="ruby-identifier">pred</span>, <span class="ruby-identifier">list</span>)
+    <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">null?</span>(<span class="ruby-identifier">list</span>)
+      <span class="ruby-keyword kw">nil</span>
+    <span class="ruby-keyword kw">else</span>
+      <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">pred</span>.<span class="ruby-identifier">call</span>(<span class="ruby-identifier">car</span>(<span class="ruby-identifier">list</span>))
+        <span class="ruby-identifier">cons</span>(<span class="ruby-identifier">car</span>(<span class="ruby-identifier">list</span>), <span class="ruby-identifier">filter</span>(<span class="ruby-identifier">pred</span>, <span class="ruby-identifier">cdr</span>(<span class="ruby-identifier">list</span>)))
+      <span class="ruby-keyword kw">else</span>
+        <span class="ruby-identifier">filter</span>(<span class="ruby-identifier">pred</span>, <span class="ruby-identifier">cdr</span>(<span class="ruby-identifier">list</span>))
+      <span class="ruby-keyword kw">end</span>
+    <span class="ruby-keyword kw">end</span>
   <span class="ruby-keyword kw">end</span></pre>
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