in addition to Collection each() and apply(), I wanted to make it easier to attach event listeners to node collections, so I went with David Johansson's approach for whitelisting on() and off().

The difference now is that the on() and off() methods are dynamically
added to the Collections prototype from Node, which acts as a wrapper
around each()

tests/js/unitTests.js

@@ -742,7 +742,7 @@ Test.prototype.tests = {
 
         test(shapes.length === 2, 'shapes array should have 2 elements');
         var a = 0;
-        shapes.apply('on', 'mouseover', function() {
+        shapes.on('mouseover', function() {
             a++;
         });
         circle.simulate('mouseover');