New Twiddle

controllers.application.js

import Ember from 'ember';
import { alias } from '@ember/object/computed';
import { inject as service } from '@ember/service';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
  
  apple: service(),
  prop: alias('apple.prop'),
  
  actions: {
  	updateProp() {
  		this.set('prop', 'pear');
		}
	}
                                       
                                   
  
});

services.apple.js

import Ember from 'ember';

export default Ember.Service.extend({
  prop: 'apple',
  
  setApple(value) {
   this.set('prop', value);
  }
});

templates.application.hbs

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

<p onclick={{action "updateProp"}}>change to pear</p>

<br>
<br>

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}