A convention for accessors I find useful to follow is CLASS-SLOT, where CLASS is the class at the level I’m defining the accessor, not some ancestor superclass that might be called the “base class”. So if my BAZ subclasses were called FOOMATIC and BARMATIC, FOOMATIC-QUUX and BARMATIC-QUUX. If I then subclass either of those it’s apparent where the accessors are derived from. In the case of conflicts, it also allows me to USE both packages without issues or ambiguity.

We have this well known ugly code:

(define (f x y)
(let ((a (+ 1 (* x y)))
(b (- 1 y)))
(+ (* x (square a))
(* y b)
(* a b))))

Scary, but what if we do some indentation?

(define (f x y)

 (let ((a (+ 1 (* x y)))
(b (- 1 y)))

 (+ (* x (square a))

 (* y b)
(* a b))))

Better, but I’ll need to count parenthesis to really understand what’s going on. What if we align parenthesis vertically?, at least that way I’ll know what’s inside of what.

(define (f x y)

 (let
(
(a (+ 1 (* x y)))
(b (- 1 y))
)
(+
(* x (square a))

(* y b)

 (* a b)
)
)
)

Ok, that’s much more like what I’m used to.

But, there’s potential for DRYing this up, as we have parenthesis and indentation doing the same thing, why not just use one or the other?

define (f x y)

 let
a (+ 1 (* x y))
b (- 1 y)
+
* x (square a)

 * y b

* a b

Now that’s something I like, almost Rubysh… there’s the prefix notation thing, but I actually like that.
The best part is that nothing is changed, only indentation when used substitutes parenthesis, and translation to standard lisp notation is done mechanically following a couple of rules.

What do you think?

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