ComponentHelpers

controllers.application.js

import Ember from 'ember';

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

helpers.my-divider.js

import Ember from 'ember';

export function myDivider(params, props = {}) {
  const { entity } = props;
  return Ember.String.htmlSafe(`<div class="divider ${entity ? `divider--${entity}` : ''}"></div>`);
}

export default Ember.Helper.helper(myDivider);

styles.app.css

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

.divider {
 	border: 0;
  display: block;
  height: 1px;
  border-color: rgba(0,0,0,.15);
  border-top: 1px solid rgba(0,0,0,.15);
  margin: 0;
  margin-left: auto;
  padding: 0;
}

.divider--32 {
 	width: calc(100% - 32px); 
}

.divider--64 {
 	width: calc(100% - 64px); 
}

.divider--128 {
 	width: calc(100% - 128px); 
}

.divider--256 {
 	width: calc(100% - 256px); 
}

templates.application.hbs

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

{{my-divider}}
<br>
{{my-divider entity=32}}
<br>
{{my-divider entity=64}}
<br>
{{my-divider entity=128}}
<br>
{{my-divider entity=256}}

twiddle.json

{
  "version": "0.13.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.16.2",
    "ember-template-compiler": "2.16.2",
    "ember-testing": "2.16.2"
  },
  "addons": {
    "ember-data": "2.16.3"
  }
}