struct

That's the way reference works, and this is the way your code you're used to writing would work.

But let's see the same thing with structs.

Structs are always copied, and if it's a let, it's immutable.

So here, if I have let house equal big structure, let's say that's a struct, then I say house.floors equals two will actually not even compile if I put it in a let.

See, I let house equal that, house.floors equals two, because let is not mutable.

It's the same pointer, so that is an identity for that thing that lives in the heap.

You know, like in For Each, remember in For Each, we had to do ID self, and we had to kinda s- tell the For Each thing what-- how to identify each of the things in the collection, so it could match them up with the views? Well, when we do a For Each, which is a collection of classes, boy, it's really easy to provide identity there, right? Because classes, very strong identity.

Structs have no sense of identity, zero, at all.