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// A model can be an object literal
var plainObject = {
  name: 'Counter',
  total: 0
};
 
// Define an observer method
function observer(changes){
  changes.forEach(function(change, i){
    console.log('what property changed? ' + change.name);
    console.log('how did it change? ' + change.type);
    console.log('whats the current value? ' + change.object[change.name]);
    console.log(change); // all changes
  });
}
 
// Start watching the object
Object.observe(plainObject, observer);

• At some point, you might decide that you don’t need to watch that object anymore:

Object.unobserve(plainObject, observer);