Demonstrating timer

controllers.application.js

import Ember from 'ember';
import { Promise } from 'rsvp'

export default Ember.Controller.extend({
  appName: 'Template Numbers',
  someBool: true,
  
  init() {
   	this._super(...arguments)    
    this.send('fakeCallback')
    this.send('slowCallback')
  },
  
  actions: {
    fakeCallback() {
      new Promise(resolve => setTimeout(resolve, 1000)).then(() => {
        let number = this.get('myNumber')
        number = number ? number + 1 : 1
        
        setTimeout((no) => this.send('fakeCallback2', no), 100)
        this.send('fakeCallback')
      })
    },
    
    fakeCallback2(no) {
      const rand = Math.floor(Math.random() * 1000)
      this.set('myNumber', rand)
    },
    
    slowCallback() {
      new Promise(resolve => setTimeout(resolve, 3000)).then(() => {
        this.set('model', [{a:1}, {a:2}, {a:3}])
      })
    }
  }
})

templates.application.hbs

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

{{#if model}}
	myNumber: {{myNumber}}
{{/if}}
<br>
<br>

twiddle.json

{
  "version": "1.0.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.1.4",
    "ember-template-compiler": "3.1.4",
    "ember-testing": "3.1.4"
  },
  "addons": {
    "ember-data": "3.1.0"
  }
}