[Chicken-users] ANN: new egg, Stacktor

[Mark Fredrickson]

Hi all,

I'm happy to announce my first egg: Stacktor.

Stacktor is a DSL for programming in a stack based style, like  
languages such as Forth or Factor. The idea came from a talk at my  
local Ruby user's group by Slava Pestov  on Factor. While I know Slava  
likes Lisp/Scheme, he made an offhand joke about Lisp, and I felt  
obligated to show that the Lisp/Scheme world can do stack based  
programming too.

Here's a real quick example. Let's say we want to find all the squares  
of a list that are larger than a given value. In a functional style,  
we'd either have to write it "backwards" or use a lot of intermediate  
bindings. We can skip both with in stack programming:

  (begin-stack
    9
    '(1 2 3 4 5)
    (push (lambda (x) (* x x)))
    map
    stk-swap
    (lambda (x) (lambda (y) (> y x))) ;; returns a function that will  
be pushed on the stack
    filter
    )
=> (stack 16 25)

I won't bore you with a lot details. Feel free to hit me up if you  
have more questions.

Cheers,
-Mark