observer value change requirement

controllers.application.js

import Ember from 'ember';

import { observer } from '@ember/object';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  init(){
    this._super(...arguments);
    this.set('count', 0);
    this.set('execute', true);
    this.timer();
  },
  timer: observer('execute', function(){
    console.log("observer");
    if(this.get('execute')){
      Ember.run.later((() => {
      	this.functionThatIsRunningEachTwoSeconds();
    	}), 2000);
      this.set('execute', false);
    }
  }),
  functionThatIsRunningEachTwoSeconds(){
    let count = this.get('count');
    this.set('count', count + 1);
    this.set('execute', true);
  }
});

templates.application.hbs

{{count}}

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}