Classes Vs ClassNames

components.css-classes-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  classes: 'green',
  
  classNames: 'red',
  
  didInsertElement() {
    this._super(...arguments);
    const $this = Ember.$('#' + this.get('elementId'));
    const green = $this.hasClass('green');
    const red = $this.hasClass('red');
    if (green && red) {
     	$this.css('background-color', 'pink'); 
    } else if (green) {
     	$this.css('background-color', 'green'); 
    } else if (red) {
     	$this.css('background-color', 'red'); 
    }
  },
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

{{css-classes-component}}

templates.components.css-classes-component.hbs

<div>
<h1>Css component</h1>
</div>

twiddle.json

{
  "version": "0.10.6",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.9.0",
    "ember-data": "2.9.0",
    "ember-template-compiler": "2.9.0",
    "ember-testing": "2.9.0"
  },
  "addons": {}
}