http://stackoverflow.com/questions/39901190/ember-1-13-class-names-order-in-a-component

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  classNames: ['svg-icon'],
  classNameBindings:['inactive:social__iconselected:social__icon','test'],
  test:true,
  init(){
    this._super(...arguments);
    //console.log(' Classess ',this.get('classNames'));
    //this.get('classNames').unshiftObject('svg-icon');
    //console.log(' Classess ',this.get('classNames'));
  }
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
{{my-component inactive=true }}
<br>
{{outlet}}
<br>
<br>

templates.components.my-component.hbs

my-component
{{yield}}

twiddle.json

{
  "version": "0.10.5",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.8.0",
    "ember-data": "2.8.0",
    "ember-template-compiler": "2.8.0",
    "ember-testing": "2.8.0"
  },
  "addons": {}
}