Juergen Lorenz

ju (at) jugilo (dot) de

I am a mathematician and a member of the "small is beautiful" crowd. And R5RS-Scheme is the definite example, that a small language is possible which allows one to do almost everything with it. And that in a clear syntax -- or should I better say -- with almost no syntax at all? And it is a programmable programming language! You can always add new syntax to it.

In my mind, Chicken is the best Scheme implementation. Its compiler compiles to C in the most ingenious way, it has the simplest interface to C, and it has a beautiful infrastructure, the eggs system, a helpful community and, and, and ...

Eggs

dbc

An implementation of "Design by Contract", coined by Bertrand Meyer for his Eiffel language.

multi-methods

exports two modules, methods and multi-methods. The former implements another variant of design-by-contract for procedures, the latter a variant of generic functions: The client has complete control over the multi-methods state, a search tree, and can decide where to insert methods, so that more specific methods are found before less specific ones.

low-level-macros

Low level macros made easy. A merger of the two eggs er-macros and ir-macros, which are now obsolete. Deprecated, use bindings instead.

anaphora

Anaphoric macros.

loops

Some simple loop macros.

bindings

A light-weight alternative to the matchable egg, with many enhancements. Can destructure arbitrary mixtures of lists, pseudolists, vectors and strings.

list-bindings

Restricting some macros of the bindings egg to nested list expressions and supplying define-macro as an application. Deprecated, use bindings instead.

tuples

Something like immutable random-access vectors, with empty, couples and triples as special cases, and mutable singles as a possible replacement of boxes.

cells

Simple implementation of the cell datatype, a lightweight variant of box.

lazy-lists

lazy list implementation based on lazy-seq.

treaps

A functional interface to Oleg Kiselyov's and Ivan Raikov's treap eagg

skiplists

An alternative to balanced search-trees.

random-access-lists

combine the advantages of linked lists (fast insert and remove) and vectors (fast access)

simple-tests

Some simple macros and commands which help debugging and testing

continuations

Syntactic sugar for Marc Feeley's continuation interface providing i.a. catch and throw

contracts

My first implementation of "Design by Contract". Now obsolete, use dbc instead.

er-macros

Explicit renaming macros made easy. Deprecated, use low-level-macros instead!

ir-macros

Implicit renaming macros made even easier. Deprecated, use low-level-macros instead!

Tutorials

Design by Contract

Explicit (and implicit) renaming macros made easy

The Iup GUI toolkit