title: Check if values for a key in a array of hash are defined?
body: <p>I have an array of hashes like so </p>
  
  <pre><code>[ {a:nil,...}, {a:nil,...}, ... ]
  </code></pre>
  
  <p>I'd like to check to if the value for all elements or for a particular key in the hash array are nil.</p>
  
  <p>I know you do this for a single hash like so </p>
  
  <pre><code>hash.values.include? nil
  </code></pre>
  
  <p>Is there a better way than having to iter through the array and checking each hash?</p>