Checking existence of properties in JavaScript

Question

I\'m new to JavaScript and a little bit confused with the duck typing concept. As far as I can tell, I understood the concept. But that leads to a strange consequence in my thou

Answer 1

Use try catch

$('#canvas').live('vmousedown', function(e) {
   try {
       console.log(e.originalEvent.originalEvent.touches[0].webkitForce);
   } catch(e) {
       console.error('error ...');
   }
}