Proper desctructor for an class containing dynamic array of objects

[Mike]

Hi,

my name is Mike and I'm new to D (coming from a Javabackground) 
and for fun I'm trying to learn D now.
I created a simple class

class Block {

     int a, b;
     this() {}

}

And now I have a dynamic array of objects of this class in 
another class:

class Foo {

      Block[] array  = new Block[](10);

      this() {
        for (int i = 0; i < array.length; i++) {
           array[i] = new Block();
        }
      }
}

How would a proper destructor of class Foo look like?
Is it enough to set "array" to null? Or do I have to set every 
element of the array to null and then the array, or nothing of 
that at all because the garbage collecter collects it, if the 
reference to Foo is set to null?