Component Lifecycle Mut

components.x-child.js

import Ember from 'ember';

export default Ember.Component.extend({
  vDidReceiveAttrs: null,
  didReceiveAttrs() {
    this._super(...arguments);
    console.log('\ndidReceiveAttrs', this.get('vDidReceiveAttrs'));
    this.set('vDidReceiveAttrs', 99);
    console.log('\ndidReceiveAttrs', this.get('vDidReceiveAttrs'));
  }
});

controllers.application.js

import Ember from 'ember';

const {
  Controller,
  observer
} = Ember;

export default Controller.extend({
  appName: 'Ember Twiddle',
  vDidReceiveAttrs: 2,
  oDidReceiveAttrs: observer('vDidReceiveAttrs', function() {
    console.log('didReceiveAttrs changed value', this.get('vDidReceiveAttrs'));
  })
 
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

{{x-child vDidReceiveAttrs=vDidReceiveAttrs}}

templates.components.x-child.hbs

vDidReceiveAttrs: {{vDidReceiveAttrs}}

twiddle.json

{
  "version": "0.10.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.6.0",
    "ember-data": "2.6.1",
    "ember-template-compiler": "2.6.0"
  },
  "addons": {}
}