ember-concurrency starter

controllers.application.js

import Ember from 'ember';
import { task, timeout } from 'ember-concurrency';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  foo: 0,

  myTask: task(function * () {
    let term = this.get('term');
    if (Ember.isBlank(term)) {
      console.log('its blank')
      return []; 
    }
    yield timeout(600);
    console.log('not blank')
    return 'not blank';
  }).restartable()
});

templates.application.hbs

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

<p>foo: {{foo}}</p>

{{input value=term key-up=(perform myTask)}}

twiddle.json

{
  "version": "0.10.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.6.0",
    "ember-data": "2.6.1",
    "ember-template-compiler": "2.6.0"
  },
  "addons": {
    "ember-concurrency": "latest"
  }
}