Scheme – Page 13 – Wisdom And Wonder

Armpit: Scheme Interpreter for ARM Microcontrollers

ARMPIT SCHEME is an interpreter for the Scheme language (lexically-scoped dialect of Lisp) that runs on RISC microcontrollers with ARM core.

(via reddit)

Looking at Generic Functions in Scheme

A common criticism of Scheme is that it does not have generic methods; resulting in the tedium of having to call variations of the same function but for different types. Wanting to learn more about this, within Scheme, I was pointed at TinyCLOS here and here, for reference.

(via alaric)

When it Comes to R7RS; R6RS Users are Quiet

R6RS users don’t seem to have much to say about R7RS. Most R6RS users seem to happy with Scheme and busy using it rather than worrying about how it should be split into two parts (little and big).

Change the REPL Prompt in Ikarus

Aziz added the ability to change the REPL prompt in the latest revision of Ikarus:

(waiter-prompt-string "")

(via ikarus-users)

Using Syntax Highlighting to Flag Mutation

As Robby describes here, in a recent build of DrScheme he added mutation flagging to the syntax-highlighting.

A New Version of Mini Scheme

In the past days I have hacked Atsushi Moriwaki and Akira KIDA’s MiniScheme a bit and I must say that it is quite a nice and clean implementation.

– Nils

In case you want to give it a try: http://www.t3x.org/miniscm

– Nils

(via comp.lang.scheme)

bzlib/dbi – an extensible database interface for PLT

bzlib/dbi has just been made available via planet – inspired by Perl DBI, it is an extensible database interface, currently with the following drivers implemented:
bzlib/dbd-spgsql – wraps around schematics/spgsql
bzlib/dbd-jsqlite – wraps around jaymccarthy/sqlite
bzlib/dbd-jazmysql – wraps around jaz/mysql
bzlib/dbi/app – a kill-safe wrapper over raw database handles
bzlib/dbi/pool – a database connection pool wrapper
So if you need to switch within the three databases you now can do so more easily, and you get database connection pools and kill-safe wrappers for free.
You can find more details at http://weblambda.blogspot.com/2009/09/extensible-abstract-database-interace.html – which explains more in details about the interface.

(via PLT)

SRFI Libraries for Chez Scheme

Thanks to the efforts of the SRFI authors, the R6RS SRFI library team, and Aaron, Chez has the portable R6RS SRFI libraries up and running on it.
A single R6RS code-base used among all of the different R6RS implementations means substantial code-reuse, and all of the benefits that it brings.
(via comp.lang.scheme)

Why PLT Scheme disllows one-armed ifs

In 1991 I asked Bob Hieb (Kent’s Chez Scheme buddy then, and my co-researcher on theoretical stuff) what the most frequent annoying bug was in the code. He ranked an accidentally omitted else branch among the top three. Indeed, he said that because of this, they had agreed to use WHEN and UNLESS exclusively for cases when they needed a one-armed IF and that they considered all one-armed uses as a bug or a legacy issue (which they corrected as soon as they touched a file).
We have chosen to codify their restriction. It’s a minor inconvenience that buys a good deal of clarity

(via plt)

Schemik: A Data-Paralell Scheme

Schemik is a high-level lexically-scoped implicitly-parallel dialect of Scheme and Common LISP, this means the parallel execution of programs is done independently of the programmer and each program written in Schemik always produces the same results no matter which parts of the program are executed simultaneously.

(via r6rs-discuss)