Delphi does default initialize global variables and member variables of objects. It doesn't default initialize local variables (but it should for consistency).

Inline variable declaration with initialization makes it a bit nicer. You can write:

  var myVar := 25;

To initialize myVar and type inference will make it an Integer. You can specify type if needed:

  var myVar : Integer := 25;

In their examples they say:

  ShowMessage('obj2.n2: ' + IntToStr(obj2.n2)); // Shows 0 - uninitialized memory

But actually n2 is initialized to zero.

And in the example freeing of objects, instead of using:

  obj1.Free;

They should always use:

  FreeAndNil(obj1);

That will free the object and set the object pointer to nil. Any subsequent attempt to access obj1 will result in an access violation.