New Twiddle

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}}
<br>
<br>

child-component.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  myParam : 'no param'
}).reopenClass({
	positionalParams: ['myParam']
});

child-component.template.hbs

<h3>Child-component</h3>
<p>Param: {{myParam}}</p>

child-component2.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  myParam : 'no param'
}).reopenClass({
	positionalParams: ['myParam']
});

child-component2.template.hbs

<h3>Child-component2</h3>
<p>Param: {{myParam}}</p>

my-component.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  actions : {
    swap: function() {
      if(this.child==='child-component') {
        this.set('child','child-component2');
      } else{
        this.set('child','child-component');
      }
    }
  },
  child: 'child-component'
});

my-component.template.hbs

<h2>My-component</h2>
<button {{action "swap"}}>Click me</button>
{{component child "test"}}

twiddle.json

{
  "version": "0.4.17",
  "EmberENV": {
    "FEATURES": {}
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.2.0",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.2.0/ember-data.js",
    "ember-template-compiler": "2.2.0"
  }
}