didRecvAttrs

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({

  	attrCnt: 0,
  
  	didReceiveAttrs(...args) {
      this._super(...args);
  		this.incrementProperty('attrCnt');
    }
});

controllers.application.js

import Ember from 'ember';
let dataObj = Ember.Object.extend({
	text: null,
});

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  data: dataObj.create({
  	text: 1
  }),
  
  init() {
    setInterval(() => {
			this.incrementProperty('data.text');
      
      this.set('data', dataObj.create(this.get('data')));
    }, 100);
	}
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{my-component data=data}}
<br>
<br>

templates.components.my-component.hbs

<div>
<h2>actual parameter children changes = {{data.text}}</h2>
<h2>didReceiveAttrsCnt = {{attrCnt}}</h2>
</div>

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}