Results tagged “ruby” from SweetFriday

The writer of this article, Neal Ford, apparently dislikes any comments and calls them "code smells".

He suggests that inline comments are unnecessary when method/function/procedure names are specific and they have one specific purpose.

Ford may be onto something here but he obsesses over the latest and supposedly greatest software methdologies. Some of the obsessions are dynamic languages, "agile" methodology, and "test/behaviour-driven" development. What I found worse was the re-labeling and mis-crediting of an old software development idea. Ford credits Kent Beck and calls it the "compose method" pattern but everyone else (at least those who know their history) will recognize it as a central idea in structured programming. This apparent pattern, really an old idea given a new name, describes the writing of smaller functions/methods with a clear, specific purpose. The beauty of structured programming is that it gives us a way to convert blocks of code into smaller functions.

In Processing Hack Week news...this past week, I've received two replies to my requests for task lists from the various Processing derivative projects. One from the Ruby-Processing developer and the other from the Clojure-Processing developer. The other news is that the GIT-repo for Processing is coming together.

For a course I was taking part-time at Ryerson University, I had to use the Processing language to create a 2d animation. I wasn't keen on Processing at first because the language looks like Java but it isn't that bad because Processing lets you avoid the Java stuff by supplying its own functions to use.

The project is still alive. The last time I checked it looked a little dead, but now that I've checked out the mailing list archives, it looks like it's still alive. Awesome awesome :D

cl-terrace

Thanks to the list, I've discovered another web application framework for Common Lisp called cl-terrace. It's a Model-View-Controller framework (aren't they all?) with only the View-Controller part covered. I'm not sure exactly how that works, but it uses the Hunchentoot web server, and djula, a Common Lisp template engine based on the Django templating language which is nice.

The documentation for djula should be generated by the developer since the API is apparently changing around quite a bit. Djula looks like it handles internationalization and translations in a sane way. You specify translations using a dictionary (a.k.a. hash-table), the example shows how to do this.

cl-terrace is ASDF-installable in case you're itching to try it out. Using SBCL, run this:

(require 'asdf)
(require 'asdf-install)
(asdf-install:install 'cl-terrace)

Ruby

On another note, a Ruby note, Chris Wanstrath of GitHub fame presented a keynote at the 2008 Ruby Hoedown about side projects where he said,

First off, the time issue. I don't know how many of you read RSS, but I challenge you (that's a keynote term) to give it up for a month. Just turn it off...What should you do instead? ...let other people do the filtering for you. Use your time for other things.

It's a good keynote and lots of communities could learn a thing or two from the Ruby community. The optimism of the community has to be balanced out as Unspace's Pete Forde says,

Folks in Ruby tend to write a lot of nostalgic, self-aggrandizing bullshit, though. You see a lot of "MY MY, THE COMMUNITY HAS EVOLVED INTO SOMETHING SPECIAL" and talk of changing the history of software development. I'm all for progress, and as a musician, I understand the function of hype in generating momentum. But sometimes we need to get real and be a little more harsh in our own self-analysis.

Anyway, off to write some code.

Mid-August Lisp News

Meetups

Toronto

7 August 2008, A very small gathering of Lisp users at the LinuxCaffe. Abram showed the inner workings of the game Abuse which uses Lisp for almost everything, except the core (which is written in C, this is similar to how Emacs works). An interesting question asked was whether or not the Abuse Lisp dialect supported macros, it seemed that the custom "macros" were all coded in C and thus untouchable. Next, a crazy mod that turns the game into a game of Super Mario was shown.

The disadvantages and misuse of car, cdr, caaaaar, cadaddarr, etc. were also mentioned. The consensus is that once you're using cadr, caddr, what you really want to be doing is creating a structure or object. That way you can access things by a descriptive name. An example of why this is a good idea is given by xmls, an XML parser. It parses XML and turns it into a giant list, with the first element being the element tag name, the second element being a list of element attributes, and the rest of this list being child elements. This can be tedious to navigate through.

Libraries for Scheme were also mentioned. The drawbacks of the various dialects of Scheme are that the specification does not define even the basics of common ways of dealing with libraries. Because of this, when you switch Schemes, you have to re-discover libraries that do what you want. This is an old complaint of course.

Lisp images and program startup costs were discussed in relation to Perl, PHP and Smalltalk. Some Lisps have the ability to dump a memory image and reload that later on. This improves the startup time since libraries are already loaded and not re-loaded or re-compiled. I noted that there doesn't seem to be a culture of image-sharing in the Lisp community as there is in the Smalltalk community. One reason suggested for this is that some Lisps run on 64-bit architectures and others run on 32-bit, which means code needs to re-compiled anyway. Perl and PHP were said to have no way of image dumping and this is particularly problematic for PHP since it seems to rebuild things for each website request. (This may be incorrect or a non-problem)

Finally, I mentioned traits in Smalltalk. Traits are collections of methods that can be used by classes and overridden (or not). Eiffel seems to have something similar, as does Ruby with mixins. Here is the paper that explains the idea more fully[PDF].

comp.lang.lisp

Kenny Tilton, the man behind Cells and Theory Y Algebra, asked why the special variable *default-pathname-defaults* is named that way. Pascal Costanza comes up with an answer and asks his own question in return,

Do you guys also worry about important problems?

Blogs

Xach's Cool Charts

Xach made some cool charts inspired by Tufte and stream graphs. The first chart shows movie box office data, while the second shows the version control activity of CMUCL and SBCL.

The charts were made using Vecto, a simple vector drawing library for Common Lisp.

cl-cairo2 updates

This is a nice update for cl-cairo2 users. Now cl-cairo2 loads only OS-independent parts of the library, with the OS-dependent parts becoming parts of extension packages.

Lisp Quiz

Lisp Quiz is inspired by Ruby Quiz which was inspired by Perl Quiz of the week. Ruby Quiz and Perl Quiz were weekly programming challenges, and Lisp Quiz hopes to do the same for the Lisp community. The first quiz tackles Minesweeper, having you design an algorithm that wins the game.

Everything Else

LispForum

LispForum, launched on 27 June 2008, is another place for Lisp-related discussion. It is run by Dave Roberts, the blogger who is behind the Finding Lisp blog. They have added a new sub-forum for Lisp Quiz puzzles which are supposed to be similar to the Ruby Quiz puzzles.

What's interesting about LispForum is that it's new (almost 2 months old, only!) and it already has 296 members. There are already 443 posts about Common Lisp, though there don't appear to be many Scheme fans. So we have yet another forum to recommend to newbie Lisp programmers.

Today is ShoesFest and I am going to be trying to learn more about Ruby and Shoes but at the same time I will be hacking away at JavaScript and Java, improving Sandals.

That's the big surprise: Sandals. Sandals is going to be a clone of the Shoes toolkit except it will use a Java back-end named BeachHouse. The primary reason for this is because I need to practice my Java'ing, and the secondary reason is that I hope to eventually have JRuby and Jython using BeachHouse. So BeachHouse can be found in the beachhouse/ sub-directory of the Sandals source code package.

Unfortunately, Sandals uses Java's Swing components for some parts but I'm going to try and code up my own drawing methods for the tricky things that Shoes can do. We'll see how that goes later on today.

Happy Shoes hackin'

Links:

• Shoes source code
• Sandals and BeachHouse source code
• Common Questions about Shoes and ShoesFest answered

A reddit user by the name of alanshutko stated what was necessary to make Scheme, Common Lisp, Haskell, and other non-mainstream languages more appealing to the average programmer.

Compare that with the types of simple programs we see in Perl and Python. "I have a bunch of files, and I want to rename them all according to some pattern." Common problem, easy solution. "I've got a log file full of email addresses, I need to strip them out from the log entries, remove duplicates, and add them to a database." Again, fairly simple, fairly small, really useful. When Haskell can compete on those types of problems, it'll be easier to induce people to learn it. (Same with CL, my fav language....)

So here is a Scheme program that does this. It is written to use MzScheme because that's the only Scheme I have installed in Windows at the moment. Thus, it takes advantage of PLaneT and the other libraries that come with MzScheme.

Hopefully this can convince others that Scheme is a good language for common tasks.