title: Rails check if an array exists
body: <p>Sorry for my probably noobish question; I recently started developing with Rails.
  I checked through the API, documentation, and did a bunch of searches but could not find what I was look for.</p>
  
  <p>Is there a method to check to see if a specific array exists?</p>
  
  <p>For example, </p>
  
  <pre><code>    array = []
      array = [2,3,4]
      if array.exists?
        puts "array exists!"
      else
        puts "No such thing!"
      end
  </code></pre>
  
  <p>Thanks</p>