Help for a newby

[David Smith]

I am just learning Swarm, going through the tutorials.

In the declarations found in the .h files I find the following:

FoodSpace *food;
id <Grid2d> world;
Bug *reportBug; 

id bugList;
...
etc.

What is the difference between these declarations? Wouldn't it siginfy 
the same to declare
id <Grid2d> World;
like
Grid2d *world;
?

I assume that 
id bugList;
declares a variable, bugList, as a reference to a generic object that may 
need to be typecast later. It appears to be magically cast in the .m file 
with 
buglist = [List create: self];

David Smith

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