Block 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}}


{{my-component}}


{{#my-component}}
  hello
{{/my-component}}


{{#my-component what=false}}
if else
{{/my-component}}

<br>
<br>

my-component.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  what: true
});

my-component.template.hbs

-> 
{{#unless hasBlock}}
  please pass me a block
{{else}}
  
    {{yield}}test
  
    {{yield to="inverse"}}testing
  
{{/unless}}

twiddle.json

{
  "version": "0.5.0",
  "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/2.2.0/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.2.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember-template-compiler.js"
  }
}