>.</td></tr>
<tr><td valign="top"><a href="#length-1">length/1</a></td><td>
  Returns the length of <code>Iterator</code>, for example:.</td></tr>
<tr><td valign="top"><a href="#map-2">map/2</a></td><td>
  Takes a function <code>Fun</code> from <code>A</code>s to <code>B</code>s, and an <code>Iterator1</code> of
  <code>A</code>s and produces an <code>Iterator2</code> of <code>B</code>s by applying the function
  to every element in the iterator.</td></tr>
<tr><td valign="top"><a href="#mapfoldl-3">mapfoldl