SO#43394353

components.test-comp.js

import Ember from 'ember';

export default Ember.Component.extend({
	classNames:['brdr','mrgnL0R0']

});

controllers.about.js

import Ember from 'ember';

export default Ember.Controller.extend({
	str:'dilip kumar',
	arr:[{name:'ravi kumar'}]
});

controllers.application.js

import Ember from 'ember';

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

controllers.home.js

import Ember from 'ember';

export default Ember.Controller.extend({
});

router.js

import Ember from 'ember';
import config from './config/environment';

const Router = Ember.Router.extend({
  location: 'none',
  rootURL: config.rootURL
});

Router.map(function() {
  this.route('about');
  this.route('home');
});

export default Router;

routes.about.js

import Ember from 'ember';

export default Ember.Route.extend({
  arrm:[{name:'ravi kumar'}],
  setupController(controller){
   let arr = []; Ember.$.extend(true, arr, this.get('arrm')); 
   controller.set('arr',arr); 
  }
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  redirect:function()
  {
    this.transitionTo('about');
  }
});

routes.home.js

import Ember from 'ember';

export default Ember.Route.extend({
  redirect:function()
  {
    this.transitionTo('application');
  }
});

templates.about.hbs

<h1>About</h1>
{{test-comp arr=(readonly arr) str=(readonly str)}}
{{outlet}}

<p>{{str}}</p>

{{#each arr as |item|}}
	<p>{{item.name}}</p>
{{/each}}

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
{{#link-to 'home'}}Home{{/link-to}}
{{#link-to 'about'}}About{{/link-to}}
<br>
{{outlet}}
<br>
<br>

templates.components.test-comp.hbs

<h1>Chid Component</h1>
<hr>
<p>String: {{input value=str}} : {{str}}</p>
{{#each arr as |item|}}
	<p>arr: {{input value=item.name}} : {{item.name}}</p>
{{/each}}

templates.index.hbs

<h3>Home page</h3>

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}