https://stackoverflow.com/questions/44856284/what-to-use-instead-of-bind-attr-helper-in-ember-js

controllers.application.js

import Ember from 'ember';

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

controllers.index.js

import Ember from 'ember';


export default Ember.Controller.extend({
  className:"red",
  actions:{
    toggleColor: function(){
      if(this.get("className") == "red"){
        this.set("className","blue");  
      }else{
        this.set("className","red");  
      }
      
    }
  }
});

routes.index.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
    return [{
      "name" : "Google",
      "headquarters": "Mountain View, California, United States of America",
      "revenue":"59825000000"
      },{
        "name" : "Facebook",
        "headquarters":"Menlo Park, California,United States of America",
        "revenue":"7870000000"
      },{
        "name" : "twitter",
        "revenue": "664000000",
        "headquarters":"San Francisco, California, United States of America"
      }];
  }
});

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}
.red {
  background-color: red;
}
.blue {
  background-color: blue;
}  

templates.application.hbs

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

templates.index.hbs

<table id="t01">
          <tr>
            <th>Company Name</th>
            <th>Headquarters</th> 
            <th>revenue</th>
          </tr>
          {{#each model as |index|}}
            <tr>
    			<td >  {{index.name}} </td>
    			<td class="{{className}}"> {{index.headquarters}} </td>
    			<td class="bigger">  {{index.revenue}} </td>
            </tr>
          {{/each}}
    </table>
    <button {{action "toggleColor"}}> Change color </button>
    CurrentColor: {{className}}

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}