services

application.controller.js

import Ember from 'ember';

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

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{cart-contents}}
<br>
<br>

cart-contents.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  //will load the service in file /app/services/shopping-cart.js
  cart: Ember.inject.service('shopping-cart'),
  
   actions: {
    remove(item) {
      this.get('cart').remove(item);
    }
  }
});

cart-contents.template.hbs

<ul>
  {{#each cart.items as |item|}}
    <li>
      {{item}}
      <button {{action "remove" item}}>Remove</button>
    </li>
  {{/each}}
</ul>

services.shopping-cart.js

import Ember from 'ember';

export default Ember.Service.extend({
  items: null,

  init() {
    this.set('items', ['pomme','tomate', 'sucre']);
  },

  add(item) {
    this.get('items').pushObject(item);
  },

  remove(item) {
    this.get('items').removeObject(item);
  },

  empty() {
    this.get('items').setObjects([]);
  }
});

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"
  }
}