The Low and High compiler intrinsics make array indexes easy to deal with. You don't need to care about the indexing to iterate over the array. You just go from Low(array) to High(array):

http://docwiki.embarcadero.com/Libraries/Berlin/en/System.Lo...

I don't remember if Apple Pascal had those intrinsics or not. But I never saw any code that used them, and I read most of the Pascal code base for MPW and a bunch for the OS.

Turbo Pascal had them.