M000075.html in facets-0.7.2

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-  <title>middle (Array)</title>
+  <title>combinations (Array)</title>
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-  <pre><span class="ruby-comment cmt"># File lib/facet/array/middle.rb, line 15</span>
-  <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">middle</span>(<span class="ruby-identifier">offset</span>=<span class="ruby-value">0</span>)
-    <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">at</span>( (<span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">length</span> <span class="ruby-operator">/</span> <span class="ruby-value">2</span>) <span class="ruby-operator">+</span> <span class="ruby-identifier">offset</span> )
+  <pre><span class="ruby-comment cmt"># File lib/facet/array/combinations.rb, line 25</span>
+  <span class="ruby-keyword kw">def</span> <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">combinations</span>(<span class="ruby-identifier">head</span>, <span class="ruby-operator">*</span><span class="ruby-identifier">rest</span>)
+    <span class="ruby-identifier">crest</span> = <span class="ruby-identifier">rest</span>.<span class="ruby-identifier">empty?</span> <span class="ruby-value">? </span>[[]] <span class="ruby-operator">:</span> <span class="ruby-identifier">combinations</span>(<span class="ruby-operator">*</span><span class="ruby-identifier">rest</span>)
+    <span class="ruby-identifier">head</span>.<span class="ruby-identifier">inject</span>([]) { <span class="ruby-operator">|</span><span class="ruby-identifier">combs</span>, <span class="ruby-identifier">item</span><span class="ruby-operator">|</span> <span class="ruby-identifier">combs</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">crest</span>.<span class="ruby-identifier">map</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">comb</span><span class="ruby-operator">|</span> [<span class="ruby-identifier">item</span>] <span class="ruby-operator">+</span> <span class="ruby-identifier">comb</span> } }
   <span class="ruby-keyword kw">end</span></pre>
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