-1">hd/1</a></td><td>
  Returns the head of <code>Iterator</code>, that is, the first element, for  
example:.</td></tr>
<tr><td valign="top"><a href="#is_iterator-1">is_iterator/1</a></td><td>
  Tests if the given <code>Candidate</code> is an iterator, returns <code>true</code> if it
  and <code>false</code> otherwise.</td></tr>
<tr><td valign="top"><a href="#join-2">join/2</a></td><td>
  Inserts <code>Sep</code> between each element in <code>Iterator1</code>.</td></tr>
<tr><td valign="top"><a href="#keyde