New Twiddle

application.controller.js

import Ember from 'ember';

const { computed, get, set } = Ember;

export default Ember.Controller.extend({
  person: {
  	first: 'Roger',
    last: 'Rabbit',
    biography: 'He was described as a frantic over-anxious type.'
  },
  
  fullName: computed('person.{first,last}', function() {
    let firstName = get(this, 'person.first');
    let lastName = get(this, 'person.last');
    
    return `${firstName} ${lastName}`;
  }),
  
  biography: computed('person.biography', {
    get() {
    	return get(this, 'person.biography');
  	},
  	set(_, value) {
    	return value;
    }
  }),
  
  actions: {
    reset() {
    	this.notifyPropertyChange('biography');
    }
  }
});

application.template.hbs

<h1>{{fullName}}</h1>
<br>
<br>
{{biography}}
<br>
<br>
<br>
<br>
<input value={{biography}}
	oninput={{action (mut biography) value="target.value"}}>
<br>
<br>
<br>
<button onclick={{action "reset"}}>
	Reset Biography
</button>

twiddle.json

{
  "version": "0.6.0",
  "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/2.3.1/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.3.3/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember-template-compiler.js"
  }
}