Ember.js: declaring a computed property with Ember.computed and an observer with Ember.observer - http://blog.ksol.fr/ember-js-declaring-computed-property-and-observers/

gistfile1.js

export default Ember.Object.extend({
  firstName: "Bob",
  lastName: "Jones",
  fullName: Ember.computed('firstName', 'lastName', function() {
    return `${this.get('firstName')} ${this.get('lastName')}`;
  }),
  nameHasChanged: Ember.observer('fullName', function() {
    console.log(`name has changed! Now it is ${this.get('fullName')}`);
  })
});