Yield Inverse Params

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}}
<br>
<br>
{{#my-component as |salutation|}}
  <strong>Salutation:</strong> {{salutation}}
  {{else}}
  <em>Salutation:</em> {{salutation}}
{{/my-component}}

my-component.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  greeting: 'Hello',
  goodbye: 'Goodbye',
  showGreeting: true,
  actions: {
    toggleGreeting() {  this.toggleProperty('showGreeting'); }
  }
});

my-component.template.hbs

<button {{action "toggleGreeting"}}>Toggle</button>
{{#if showGreeting}}
<h1>{{yield greeting}}</h1>
{{else}}
<h1>{{yield goodbye to="inverse"}}</h1>
{{/if}}

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"
  }
}