lookout.js example

gistfile1.js

var myObject = { id: 100, name: 'my object' };

// Subscribe to changes to all properties of the myObject object.
// The callback accepts the property name along with the previous and current value
// of the property.
lookout(myObject, function(prop, oldValue, newValue) {
  // Log the name of the property that changed and it's previous/current value.
  console.log(prop + ' just changed from [' + oldValue + '] to [' + newValue + ']');
});

// Subscribe to changes on specific properties:

// An array of properties.
lookout(myObject, ['id', 'name'], function(prop, oldValue, newValue) {
  console.log(prop + ' just changed from [' + oldValue + '] to [' + newValue + ']');
});

// A single property.
lookout(myObject, 'id', function(prop, oldValue, newValue) {
  console.log(prop + ' just changed from [' + oldValue + '] to [' + newValue + ']');
});

// Discontinue property change notifications.
disregard(myObject);