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  <title>group_by (Enumerable)</title>
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  <pre><span class="ruby-comment cmt"># File lib/simple_mapper/support/core_ext.rb, line 67</span>
  <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">group_by</span>
    <span class="ruby-identifier">inject</span>({}) <span class="ruby-keyword kw">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">groups</span>, <span class="ruby-identifier">element</span><span class="ruby-operator">|</span>
      (<span class="ruby-identifier">groups</span>[<span class="ruby-keyword kw">yield</span>(<span class="ruby-identifier">element</span>)] <span class="ruby-operator">||=</span> []) <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-identifier">element</span>
      <span class="ruby-identifier">groups</span>
    <span class="ruby-keyword kw">end</span>
  <span class="ruby-keyword kw">end</span></pre>
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simplemapper-0.0.1 doc/classes/Enumerable.src/M000040.html