New Twiddle

controllers.application.js

import Ember from 'ember';

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

helpers.my-helper.js

import Ember from 'ember';

export function myHelper(params, hash) {
  console.log('params', params);
  console.log('hash', hash);
  console.log('calling toString in params', params.toString());
  console.log('calling toString in hash', hash.toString());
  return params;
}

export default Ember.Helper.helper(myHelper);

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>
Helper:
{{my-helper 123 precision=0}}

twiddle.json

{
  "version": "0.10.5",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "alpha",
    "ember-data": "2.8.0",
    "ember-template-compiler": "alpha",
    "ember-testing": "alpha"
  },
  "addons": {}
}