ember-concurrency as closure function

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  actions:{
   submit(){
     this.get('submit')(this.get('x')).then((retval)=>{
       this.set('multiplicationResult', retval);
     })
   }
  }
});

controllers.application.js

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

function aFunctionWhichReturnsPromise(val){
return new Ember.RSVP.Promise((r)=>{
        setTimeout(()=>{
          r(`${val}*2 multiplication result is ${val*2}`);
        }, 5000);
    })
}


export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  x:1,
  
  myAsyncTask: task(function *(val){
    this.set('log1', `task started with ${val}`);
    let valueToReturn
    yield aFunctionWhichReturnsPromise(val).then((promiseResult)=>{
      valueToReturn = promiseResult
    });
    this.set('log2', `task is ending with ${val}`);
    return valueToReturn
  }).drop(),
  
  actions:{
    submit(val){
      return this.get('myAsyncTask').perform(val);
    },
    increase(){
      this.incrementProperty('x');
    }
  }  
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{my-component x=x submit=(action 'submit') increase=(action 'increase')}}
<hr>

<br>
{{log1}}
<br>
{{log2}}

templates.components.my-component.hbs

<br>
<br>
x: {{x}} <br>
<br>
<button onclick={{action increase}}>Increase</button> <br>
<br>
<button onclick={{action 'submit'}}>Submit</button>
<br>
{{multiplicationResult}}

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-concurrency":"0.8.13"
  }
}