yielding-component

application.controller.js

import Ember from 'ember';

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

application.template.hbs

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

{{#parent-component as |par|}}
 {{par.tool-bar}}
{{/parent-component}}
<br>
<br>

child-component.component.js

import Ember from 'ember';

export default Ember.Component.extend({
});

child-component.template.hbs

<h3>Child Component</h3>
{{childFoo}}
{{yield}}

parent-component.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  fooProp: 'fooProp'
});

parent-component.template.hbs

<h3>Parent Component</h3>

{{yield (hash
  name=fooProp
  tool-bar=(component 'child-component' childFoo=fooProp))}}

twiddle.json

{
  "version": "0.6.4",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.1/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.4.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.1/ember-template-compiler.js"
  }
}