JS/HBS Hierarchy in Components

components.bar-comp.js

import Ember from 'ember';

export default Ember.Component.extend({
  // Count here demonstrates that this component provides data
  count: 0,
  
  dataToBeYielded: Ember.computed('count', function() {
    return `Hello from bar! Count is ${this.get('count')}.`;
  }),
  
  actions: {
  	incrementCount() {
      this.set('count', this.get('count') + 1);
    }
  }
});

components.foo-comp.js

import Ember from 'ember';

export default Ember.Component.extend({
  // We have no access to `data` and `incrementCount` yielded by bar-comp
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

{{foo-comp}}

templates.components.bar-comp.hbs

{{yield dataToBeYielded (action 'incrementCount')}}

templates.components.foo-comp.hbs

{{#bar-comp as |data incrementCount|}}
	<div>
    In <code>foo-comp.hbs</code>: {{data}}
  </div>
  
  <div>
  	<button type="button" {{action incrementCount}}>Increment Count</button>
  </div>
{{/bar-comp}}

<div style="margin-top: 20px">
  Several things to note here:
  <ul>
    <li><code>data</code> and <code>incrementCount</code> are not available here. Data: {{data}} (It should be blank)</li>
    <li><code>foo-comp.js</code> does not have access to things yielded by <code>bar-comp</code></li>
    <li>To overcome the limitation of <code>yield</code>, <a href="https://ember-twiddle.com/d7b42d2c6d480dda2972cef08563b4e5">HOC is a better option (Right click to open in new tab)</a></li>
  </ul>
</div>

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}