Render Function

components.foo-bar.js

import Ember from 'ember';

const { get } = Ember;

export default Ember.Component.extend({
  
  name: 'Travis',
  
  didReceiveAttrs() {
    this._super(...arguments);
    
    // call render function
    const stringToRender = this.render.call(this);
  },
  
  
  render() {
    const name = get(this, 'name');
    return `Hello ${name}`;
  }
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

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

templates.components.foo-bar.hbs

{{yield}}

twiddle.json

{
  "version": "0.9.2",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.6.0",
    "ember-data": "2.6.0",
    "ember-template-compiler": "2.6.0"
  }
}