Could I please ask:

This code works fine:

class MyClass
{
  constructor()
  {
    this.m_observable = Rx.Observable.of(1, 2);
    
      this.m_observable.subscribe(
                                 function (x) {alert(x);}
                                 );
  }
  
  DoIt(x)
  {
    alert(5 * x);
  }
}

When I create a new instance of the class I see "1" then "2".

I would like to call the DoIt method of the class when the subscription fires, this code does not work, I see no alerts:

class rxjsShapeShifter
{
  constructor()
  {
    this.m_observable = Rx.Observable.of(1, 2);
    
      this.m_observable.subscribe(
                                 this.DoIt;
                                 );
  }
  
  DoIt(x)
  {
    alert(5 * x);
  }
}

How can I call that method from the observable subscription?

Thanks for any help.