get / set CP

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  cp1: Ember.computed(function() {
    console.log('cp1 got');
    return 'one';
  }),
  cp2: Ember.computed({
    get() {
	    console.log('cp2 got');
      return 'two';
    }
  }),
  cp3: Ember.computed({
    get() {
	    console.log('cp3 got');
      return 'three';
    },
    set(prop, val) {
      return val;
    }
  }),
  init() {
    this.setProperties({
      cp1: 'Changed 1',
      cp2: 'Changed 2',
      cp3: 'Changed 3',
    });
  }
});

templates.application.hbs

<h1>Testing CP</h1>
<br>
<br>
{{cp1}}
<br>
<br>
{{cp2}}
<br>
<br>
{{cp3}}
<br>
<br>

twiddle.json

{
  "version": "0.7.2",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": true,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.4/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.4.3/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.4/ember-template-compiler.js"
  }
}