New Twiddle

application.controller.js

import Ember from 'ember';

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

application.template.hbs

{{input type='checkbox' checked=isInverse}}

{{#my-component isInverse=isInverse as |foo|}}
  non inverse: {{foo}}
{{else}}
  inverse: {{foo}}
{{/my-component}}

my-component.component.js

import Ember from 'ember';

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

my-component.template.hbs

{{#if isInverse}}
  {{yield 456 to="inverse"}}
{{else}}
  {{yield 123}}
{{/if}}

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"
  }
}