EMBER Issue each helper

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Ember Twiddle',
  arr: [{a:1,b:2},{a:5,b:4}],
  newArr: [],
  onchange: Ember.observer('newArr', function() {
    console.log(this.get('newArr'), 'dd');
  }),
  actions: {
    change() {
      this.set('arr', []);
     this.set('arr', [{a:7,b:2},{a:9,b:4}]);
    }
  }
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{#each arr as |value|}}
{{samp-comp value=value newArr=newArr}}
{{/each}}
<button {{action "change"}}>hello</button>
<br>
<br>
{{#each newArr as |value|}}
{{value.a}}
{{/each}}

samp-comp.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  registerOption: Ember.on('willInsertElement', function() {
    debugger;
    this.get('newArr').pushObject(this.get('value'));
    //console.log(this.get('value.a'), this.get('newArr'));
  }),
  unRegisterOption: Ember.on('willDestroyElement', function() {
    debugger;
  this.get('newArr').removeObject(this.get('value'));
    //console.log('remo');
  }),
});

samp-comp.template.hbs

{{value.a}}

twiddle.json

{
  "version": "0.5.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "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/2.2.0/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.2.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember-template-compiler.js"
  }
}