New Twiddle

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  didReceiveAttrs() {
    console.log('received attrs');
  },
  didUpdateAttrs() {
    console.log('updated attrs');
  }
  
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  myArray: [],
  counts: 0,
  actions: {
    updateArr() {
      this.incrementProperty('counts');
      this.set('myArray', [...this.get('myArray'), this.get('counts')]);
    }
  }
});

templates.application.hbs

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

<button {{action "updateArr"}}>Update!</button>
{{my-component arr=myArray}}
{{outlet}}
<br>
<br>

twiddle.json

{
  "version": "0.7.2",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.4/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.4.3/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.4/ember-template-compiler.js"
  }
}