Computed Update Count

controllers.application.js

import Ember from 'ember';

function CustomComputedGt(dependentProperty, value) {
  var isSubscribed = false;
  var lastState;
  
  function gt(context) {
    return context.get(dependentProperty) > value;
  }
  
  return Ember.computed({
    get: function (property) {
      if (!isSubscribed) {
      	this.addObserver(dependentProperty, this, function () {
          var newState = gt(this);
          
          if (newState !== lastState) {
          	this.notifyPropertyChange(property);
            lastState = newState;
          }
        });
        isSubscribed = true;
      }
      
      lastState = gt(this);
      
      return lastState;
    }
  }).volatile();
}

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  counter: 0,
  callCount: 0,
  ocallCount: 0,
  
  countGreater: CustomComputedGt('counter', 5),
  
  setCounter: Ember.on('init', function(){
    setInterval(function(){
      this.set('counter', this.get('counter') + 1);
    }.bind(this), 1000);
  }),
  
  //countGreater: Ember.computed.gt('counter', 5),
  
  observeCountGreater: Ember.observer('countGreater', Ember.on('init', function(){
    var countGreater = this.get('countGreater');
    var fixedCountGreater = this.get('fixedCountGreater');
    if (fixedCountGreater != countGreater){
      this.set('fixedCountGreater', countGreater);
    }
  })),
  
  prop: Ember.computed('countGreater', function(){
    this.set('callCount', this.get('callCount') + 1);
    return 'CounterGreater is ' + this.get('countGreater');
  }),
  
  oprop: Ember.computed('fixedCountGreater', function(){
    this.set('ocallCount', this.get('ocallCount') + 1);
    return 'FixedCounterGreater is ' + this.get('fixedCountGreater');
  }),
  
  actions: {
  	onReset: function() {
    	this.set('counter', 0);  
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
Counter value: {{counter}}
<br>
Prop value: {{prop}}
<br>
OProp value: {{oprop}}
<br>
Prop callcount: {{callCount}}
<br>
Observed value callcount: {{ocallCount}}
<br>
<button {{action 'onReset'}}>Reset</button>

twiddle.json

{
  "version": "0.10.6",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.9.0",
    "ember-data": "2.0.1",
    "ember-template-compiler": "2.9.0",
    "ember-testing": "2.9.0"
  },
  "addons": {}
}