title: Is it ok to use `any?` to check if an array is not empty?
body: <p>Is it bad to check if an array is <strong>not</strong> empty by using <code>any?</code> method?</p>
  
  <pre><code>a = [1,2,3]
  
  a.any?
  =&gt; true
  
  a.clear
  
  a.any?
  =&gt; false
  </code></pre>
  
  <p>Or is it better to use <code>unless a.empty?</code> ?</p>