Practice time

In this exercise, you will use FeatureLayer to set a definition expression on a layer, draw the features that match the definition expression as graphics, and respond to a hover event over the features.

Follow the given steps to complete the exercise:

1. Open the JavaScript sandbox at https://developers.arcgis.com/javascript/3/sandbox/sandbox.html.
2. Remove the JavaScript content from the <script> tag that I have highlighted, leaving an empty <script></script> block in which to write the required code:

<script> 
  var map; 
 
  require(["esri/map", "dojo/domReady!"], function(Map) { 
    map = new Map("map", { 
      basemap: "topo",  //For full list of pre-defined basemaps, 
      navigate to http://arcg.is/1JVo6Wd 
      center: [-122.45, 37.75], // longitude, latitude 
      zoom: 13 
    }); 
  }); 
</script> 

3. Create the variable that you will use to refer to the map in the <script> tag:

<script> 
  var map; 
</script>

4. Create the require...