New Twiddle

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  hasMessage: false,
  
  actions: {
    toggleMessage() {
      this.toggleProperty('hasMessage');
    },
  }
});

controllers.application.js

import Ember from 'ember';

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

});

styles.app.css

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

.card {
  border: 1px solid gray;
  margin: 20px auto;
  padding: 20px;
  width: 250px
}

.buttons {
  display: flex;
}

.button {
  flex: 1;
}

.message {
  background-color: yellow;
}

templates.application.hbs

{{my-component}}

templates.components.my-component.hbs

<div class="card">
  <div class="buttons">
    <button class="button" {{action "toggleMessage"}}>Like</button>
    <button class="button">Comment</button>
  </div>

	{{#if hasMessage}}
    <div class="message" aria-live="polite">
      <h2>Like buttons are super dope!</h2>
      <p>Some message here! <a href="">Learn more!</a></p>
    </div>
  {{/if}}
</div>

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"
  }
}