Slack example

application.controller.js

import Ember from 'ember';

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

application.template.hbs

{{component-a}}

component-a.component.js

import Ember from 'ember';

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

component-a.template.hbs

{{component "component-b"}}

component-b.component.js

import Ember from 'ember';

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

component-b.template.hbs

<button {{action "myAction"}}>click me</button><br>
result:{{result}}

twiddle.json

{
  "version": "0.6.1",
  "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/2.3.1/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.3.3/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember-template-compiler.js"
  }
}