POJO get + mut input field

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  params:{
    key1: 'hello',
    key2: 'world'
  },
  
  currentValues: Ember.computed('params.key1', 'params.key2', function() {
    return JSON.stringify(this.get('params'));
  })
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

{{#each-in params as |parameter|}}
                                    <li>
                                        {{input type="text" placeholder=parameter class="form-control" value=(mut (get params parameter))}}
                                    </li>
                                {{/each-in}}
                                
<p>Current values: {{currentValues}}</p>

twiddle.json

{
  "version": "0.10.6",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.9.0",
    "ember-data": "2.9.0",
    "ember-template-compiler": "2.9.0",
    "ember-testing": "2.9.0"
  },
  "addons": {}
}