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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Web Inspector: Show upcoming values of non-native iterators"
   href="https://bugs.webkit.org/show_bug.cgi?id=152682">152682</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Web Inspector: Show upcoming values of non-native iterators
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>WebKit
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>WebKit Nightly Build
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>Normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P2
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Web Inspector
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned&#64;lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>nvasilyev&#64;apple.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>bburg&#64;apple.com, graouts&#64;webkit.org, joepeck&#64;webkit.org, mattbaker&#64;apple.com, nvasilyev&#64;apple.com, timothy&#64;apple.com, webkit-bug-importer&#64;group.apple.com
          </td>
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        <pre>Created <span class=""><a href="attachment.cgi?id=268178" name="attach_268178" title="[Animated GIF] Actual/expected">attachment 268178</a> <a href="attachment.cgi?id=268178&amp;action=edit" title="[Animated GIF] Actual/expected">[details]</a></span>
[Animated GIF] Actual/expected

Web Inspector neatly shows upcoming values for native iterators.
<a href="https://webkit.org/blog/3516/web-inspector-console-improvements/">https://webkit.org/blog/3516/web-inspector-console-improvements/</a>
Unfortunately, it doesn't do it for developer defined iterators.

Custom data structures such as linked lists, ordered sets, ordered maps, 
sorted arrays and many others that you can find in Immutable.js[1]
and Collections.js[2] would benefit from better console logging.

Web Inspector could show upcoming values for all objects that have
Symbol.iterator property.

Reduction: <a href="http://nv.github.io/webkit-inspector-bugs/iterators-custom/">http://nv.github.io/webkit-inspector-bugs/iterators-custom/</a>

[1]: <a href="http://facebook.github.io/immutable-js/docs/">http://facebook.github.io/immutable-js/docs/</a>
[2]: <a href="http://www.collectionsjs.com/all">http://www.collectionsjs.com/all</a></pre>
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