hasBlock property

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  click() {
    window.alert(this.get('hasBlock'));
  }
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

<h1>JavaScript <code>hasBlock</code></h1>

{{#my-component}}
Click Me (will alert <code>hasBlock</code>)
{{/my-component}}

templates.components.my-component.hbs

{{yield}}
<br>
hasBlock: {{hasBlock}}
<br>
{{#if hasBlock}}
I have a block
{{/if}}

twiddle.json

{
  "version": "0.10.4",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.7.0",
    "ember-data": "2.7.0",
    "ember-template-compiler": "2.7.0"
  },
  "addons": {}
}