yield

components.main-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  myThing: 'some thing',
  init() {
    this._super(...arguments);
    this.set('myThing', 'it\'s a thing!')
  }
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
{{#main-component}}
  <h3>Yield'd</h3>
  {{thing}}
{{/main-component}}

{{outlet}}

templates.components.main-component.hbs

<h2>Main</h2>
{{yield (hash thing=myThing)}}

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": {}
}