Hi all,

I'm trying to understand the next vs rest functions.  I don't see why
you want/need both.  Is it because null is in the picture?  It seems
like the interface to a good old lisp list is 3 functions (car/first/
head, cdr/rest/tail, null?/empty?).  I can imagine making this into an
abstract immutable sequence with a java interface like:

public interface FunctionalListyThing
{
    Object first();
    FunctionalListyThing rest();
    boolean isEmpty();
}

Why does one need the 4th method, "next()" ?

thanks,
Rob

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