get-and-set-in-init

components.my-component.js

import Ember from 'ember';
const { computed } = Ember;

export default Ember.Component.extend({
  isTrue1: computed.equal('value1', 'true'),
  isTrue2: computed.equal('value2', 'true'),
  isTrue3: computed.equal('value3', 'true'),
  
  init() {
    this._super(...arguments);
    this.get('isTrue1');
    this.get('isTrue3');
    this.setProperties({
      value1: 'true',
      value2: 'true'
    });

    console.log(this.getProperties('value1', 'value2'));
  },
  
  onInit: Ember.on('init', function() {
    this.set('value3', 'true');
  })
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{my-component}}
<br>
<br>

templates.components.my-component.hbs

value1: get and set in init<br>
value2: set in init<br>
value3: get in init, set in on('init')<br><br>

isTrue1: {{isTrue1}}<br>
isTrue2: {{isTrue2}}<br>
isTrue3: {{isTrue3}}

twiddle.json

{
  "version": "0.10.2",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "release",
    "ember-data": "2.7.0",
    "ember-template-compiler": "release"
  },
  "addons": {}
}