title: What is the jQuery equivalent of mootools Array.include()?
body: <p>I'm trying to add an element to an array only if it doesn't already exist in the array.  I used to do this with the <a href="http://mootools.net/docs/Native/Array#Array:include" rel="nofollow noreferrer">Array.include</a> method of mootools, but now I'm using jquery.  </p>
  
  <p>Is there a method to do this in jquery?</p>
  
  <p><a href="http://mootools.net/docs/Native/Array#Array:include" rel="nofollow noreferrer">http://mootools.net/docs/Native/Array#Array:include</a></p>