title: Why will a Range not work when descending?
body: <p>Why will <code>(1..5).each</code> iterate over <code>1,2,3,4,5</code>, but <code>(5..1)</code> will not? It returns the Range instead.</p>
  
  <pre><code>1.9.2p290 :007 &gt; (1..5).each do |i| puts i end
  1
  2
  3
  4
  5
   =&gt; 1..5
  1.9.2p290 :008 &gt; (5..1).each do |i| puts i end
   =&gt; 5..1
  </code></pre>