Open up the first example from the chapter. We'll use Firebug again.

Before we remove features, we first need to add them to the map. We'll use the same code from the previous example. Let's create a feature object. In Firebug, type and execute:

var feature_point = new OpenLayers.Feature.Vector(new OpenLayers.Geometry.Point(-72, 42));

Now, let's add it to the map:

map.layers[1].addFeatures([feature_point]);

We have the feature on the map now, so let's see how removeFeatures works. We can call this function and either pass in a feature from the map.layers[1].features array, or pass in a feature object we've already created. Let's use the second method:

map.layers[1].removeFeatures([feature_point]);

Now you should not see any features on your map. If we check the map.layers[1].features array, it should be empty:

>>>map.layers[1].features;
[]

So, as we expected, the feature we originally...