count-animation using concurrency-only

components.count-up.js

import Ember from 'ember';
import { task, timeout } from 'ember-concurrency';
const DEFAULT_ANIMATION_DURATION = 1000;
import DidChangeAttrs from 'ember-did-change-attrs';

export default Ember.Component.extend(DidChangeAttrs, {
  startVal: 0,
  didChangeAttrsConfig: {
    attrs: ['endVal']
  },
  didInsertElement(){
    this._super(...arguments);
    this.get("runCountAnimation").perform();
  },
  didChangeAttrs(changes){
    this._super(...arguments);
    if(Ember.isPresent(changes) && Ember.isPresent(changes.endVal.current)){
      this.set("startVal", changes.endVal.previous);
      this.get("runCountAnimation").perform();
    }
  },
  runCountAnimation: task(function *(){
        let start = this.get("startVal") || 0;
        let end = this.get("endVal");
        let duration = end ? DEFAULT_ANIMATION_DURATION / end : DEFAULT_ANIMATION_DURATION;
        duration = parseFloat(duration.toFixed(1));
        duration = (duration <= 0) ? 100 : duration;
        while(start <= end){
            yield timeout(duration);
            this.set("value", start++);
        }
        // Ember.run.later(()=>{
        //     this.sendAction("onComplete");
        // }, DEFAULT_ANIMATION_DURATION - duration);
        
    }).restartable(),
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  endVal: 3,
  
  actions:{
  	update(){
      let temp = this.get("endVal") + Math.floor((Math.random() * 100) + 1);
      this.set("endVal", temp);
    }   
  }
});

templates.application.hbs

 end value {{endVal}} <br> <button {{action "update"}}>update</button> <br>

{{count-up endVal=endVal }}
<br>
<br>
{{outlet}}
<br>
<br>

templates.components.count-up.hbs

value {{value}}
{{yield}}

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": "2.14.1",
    "ember-template-compiler": "2.14.1",
    "ember-testing": "2.14.1"
  },
  "addons": {
    "ember-data": "3.4.2",
    "ember-concurrency": "0.7.19",
    "ember-did-change-attrs": "0.0.2"
  }
}