title: Dart js interop with D3
body: <p>I am trying to integrate D3 with dart: My code to this point is as follows: </p>
  
  <pre><code>import 'dart:html';
  import 'package:js/js.dart' as js;
  
  void main() {
     js.scoped(() {
       var dee3 = js.context.d3; 
       var dataset = js.array([ 5, 10, 15, 20, 25 ]);
       dee3.select("body").selectAll("p")
      .data(dataset)
      .enter()
      .append("p")
      .text(function(d) { return d; });
  
    });
  </code></pre>
  
  <p>Whenever I run this in dartium I get the following exception:
  Exception: A function must be converted to a Callback before it can be serialized. 
  How can I convert the anonymous function(d) to a callback? </p>