title: Clojure not nil check
body: <p>In Clojure <code>nil?</code> checks for nil. How does one check for not nil?</p>
  
  <p>I want to do the Clojure equivalent of the following Java code:</p>
  
  <pre><code>if (value1==null &amp;&amp; value2!=null) {
  }
  </code></pre>
  
  <p><strong>Follow-up:</strong> I was hoping for a not nil check instead of wrapping it with <code>not</code>. <code>if</code> has a <code>if-not</code> counterpart. Is there such a counterpart for <code>nil?</code>?</p>