if-switch

application.controller.js

import Ember from 'ember';

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

application.template.hbs

{{#if-switch "foo"}}
	template
{{else}}
	inverse
{{/if-switch}}

if-switch.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  positionalParams: ['name'],
  name: null,
  bool: Ember.computed(function() {
    return true;
  })
});

if-switch.template.hbs

{{#if bool}}
  {{yield}}
{{else}}
  {{yield to="inverse"}}
{{/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": "1.13.11",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.2.0/ember-data.js",
    "ember-template-compiler": "1.13.11"
  }
}