title: Is there a Ruby, or Ruby-ism for not_nil? opposite of nil? method?
body: <p>I am not experienced in Ruby, so my code feels "ugly" and not idiomatic:</p>
  
  <pre><code>def logged_in?
    !user.nil?
  end
  </code></pre>
  
  <p>I'd rather have something like </p>
  
  <pre><code>def logged_in?
    user.not_nil?
  end
  </code></pre>
  
  <p>But cannot find such a method that opposites <code>nil?</code></p>