title: Hidden features of Clojure
body: <p>Which lesser-known but useful features of Clojure do you find yourselves using? Feel free to share little tricks and idioms, but try to restrict yourselves to Core and Contrib.</p>
  
  <p>I found some really interesting information in answers to these similar questions:</p>
  
  <ul>
  <li><a href="https://stackoverflow.com/questions/211216/hidden-features-of-haskell">Hidden features of Haskell</a></li>
  <li><a href="https://stackoverflow.com/questions/101268/hidden-features-of-python">Hidden features of Python</a></li>
  <li><a href="https://stackoverflow.com/questions/15496/hidden-features-of-java">Hidden features of Java</a></li>
  <li><a href="https://stackoverflow.com/questions/132241/hidden-features-of-c">Hidden features of C</a></li>
  <li><a href="https://stackoverflow.com/questions/161872">Hidden features of Perl</a></li>
  <li><a href="https://stackoverflow.com/questions/63998/hidden-features-of-ruby">Hidden features of Ruby</a></li>
  </ul>
  
  <p>There are many more "Hidden feature" questions for other languages, so I thought it would be nice to have one for Clojure, too.</p>