title: Looking for analog of RxJs ofObjectChanges method in Angular 2
body: <p>I want to create class property decorator which will look for all changes of this property and do some stuff. How can i do that? </p>
  
  <p>In RxJs i found <code>ofObjectChanges</code> method
  <a href="https://github.com/Reactive-Extensions/RxJS/blob/master/doc/api/core/operators/ofobjectchanges.md" rel="noreferrer">https://github.com/Reactive-Extensions/RxJS/blob/master/doc/api/core/operators/ofobjectchanges.md</a></p>
  
  <p>but looks like that method does not exist in angular2 RxJs version.</p>
  
  <p>That method must trigger on changes of object, for example with Array.push();</p>