New Twiddle

components.display-text.js

import Ember from 'ember';

export default Ember.Component.extend({
  text: 'Default text!'
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  text: 'Text coming from controller',
  
  actions: {
    changeText() {
      this.set('text', 'Random text: ' + Math.random());
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{display-text text="This has text passed in statically"}}
{{display-text}}

<button {{action "changeText"}}>Change controller text</button>
{{display-text text=text}}
<br>
<br>

templates.components.display-text.hbs

{{text}}

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}