New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  placeholder: undefined,
  name: undefined,
  actions: {
    setValues: function() {
     this.setProperties({
       placeholder: 'this is the placeholder',
       name: 'this-name'
     });
    },
    setUndefined: function() {
     this.setProperties({
       placeholder: undefined,
       name: undefined
     });
    }
  }
});

templates.application.hbs

<h3>This demonstrates another possible bug with the input helper</h3>

<hr />

{{input type='text' placeholder=placeholder name=name}}

<hr />

<button {{action 'setValues'}}>1 Set values</button><br />
<button {{action 'setUndefined'}}>2 Set undefined</button>(<span style="background-color: yellow">both placeholder and name will have values of "null"</span>)

<hr />

placeholder={{placeholder}}, name={{name}}

twiddle.json

{
  "version": "0.7.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "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/2.4.3/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.4.3/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.3/ember-template-compiler.js"
  }
}