title: JQuery - Clone multiple selected options - How can I check if exists?
body: <p>I have a select list that contains a number of options. The user can select multiple options and 'assign' them to another select list. The problem I am having is how can I check to make sure one or more of the selected options are not part of the list being copied to? I understand I can use the following code to determine if a single value i.e. 'bar' exists in the other list, but how do I check if any of the multiple selected options exist?</p>
  
  <pre><code>var exists = false;
  $('#select-box option').each(function(){
  if (this.value == 'bar') {
      exists = true;
      return false;
  }
  });
  </code></pre>
  
  <p>Thanks so much in advance.</p>