Languages query params

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  selectedLanguages: [],
  queryParams: ['selectedLanguages'],
  
  init() {
    this._super(...arguments);
  },
  
  languages: [
    {
   		code: 'en',
      name: 'English'
    },
    {
   		code: 'es',
      name: 'Spanish'
    },
    {
   		code: 'fr',
      name: 'French'
    },
    {
   		code: 'de',
      name: 'German'
    },
  ],
  
  languagesWithSelected: Ember.computed('selectedLanguages.[]', 'languages.@each.code', {
    get() {
      return this.get('languages').map(({code, name}) => ({
        code,
        name,
        checked: this.get('selectedLanguages').includes(code),
      }));
    }
  }),
  
  actions: {
    toggleLanguage(language) {
      const selectedLanguages = this.get('selectedLanguages');
      const {code} = language;
      
      if(selectedLanguages.includes(code)) {
        selectedLanguages.removeObject(code);
      } else {
        this.get('selectedLanguages').pushObject(code);
      }
    }
  }
});

templates.application.hbs

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

{{#each languagesWithSelected as |language|}}
	<div>
    <input type="checkbox" onclick={{action 'toggleLanguage' language}} checked={{language.checked}} />
    {{language.name}}
  </div>
{{/each}}

<br>

<h4>Checked languages</h4>
{{#each selectedLanguages as |language|}}
	{{language}}<br>
{{/each}}

twiddle.json

{
  "version": "0.10.7",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.10.0",
    "ember-data": "2.10.0",
    "ember-template-compiler": "2.10.0",
    "ember-testing": "2.10.0"
  },
  "addons": {}
}