emberjs_computed_properties.js

MyApp.president = Ember.Object.create({
  firstName: "Barack",
  lastName: "Obama",
  fullName: function() {
    return this.get('firstName') + ' ' + this.get('lastName');
  // Tell Ember that this computed property depends on firstName
  // and lastName
  }.property('firstName', 'lastName')
});

Many computed properties have dependencies on other properties. For example, in the above example, the fullName property depends on firstName and lastName to determine its value. You can tell Ember about these dependencies like this: