valid input

controllers.application.js

import Ember from 'ember';
const { computed } = Ember;

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  value: 'test',
  
  inputIsValid: computed('value', function() {
	  return this.get('value').includes('will');
  })
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
<input value={{value}} oninput={{action (mut value) value="target.value"}} >

{{inputIsValid}}
<br>
<br>

twiddle.json

{
  "version": "0.13.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.16.2",
    "ember-template-compiler": "2.16.2",
    "ember-testing": "2.16.2"
  },
  "addons": {
    "ember-data": "2.16.3",
    "ember-concurrency": "0.8.16"
  }
}