Yeah! I am one of the two winners of the programming competition I talked about at Playing with Dijkstra.
Furthermore, Thammi, a friend of mine, is the winner of the category “crazy” with a brainfuck implementation! […]
Ruby Brainfuck golf [Update]
Some days ago, I discovered a website – which is the most addicting one I know :) – codegolf.com. The goal is, to solve programming problems with as short code as possible.
As I said, it is addicting. You do not write better ruby code by golfing. But you can really improve the knowledge of the language. And it is fun :)
Brainfuck
After doing some of the other challenges I tried the brainfuck challenge.
Brainfuck is a Turing-complete esoteric programming language consisting only of 8 letters, operating on a 30000 cells-array. This is the hello world program:
>+++++++++[<++++++++>-]<.>+++++++[<++++>-]<+.+++++++..+++.[-]>++++++++[<++++>-]
<.>+++++++++++[<++++++++>-]<-.--------.+++.------.--------.[-]>++++++++[<++++>-
]<+.[-]++++++++++.The goal is to build a interpreter. […]
Quicksort in 5 minutes
Some time ago, I conducted a short presentation about Ruby. And to impress the audience, I did some live coding and implemented the quicksort algorithm in 5 minutes. They were impressed :) […]
Troubleshooting an aegis-permission problem
In my current Rails project, I use the aegis gem for rights management. And I almost got mad, wondering, why it wouldn’t work.. […]
PlasmaRails.org
PlasmaRails.org is an online RDoc for Edge Rails, which is regenerated every day. It is based on sdoc with some custom css.
Update 06.06.2010: Relaunched with better stylesheets! […]
Playing with Dijkstra
About a year ago, some students at my university announced a little programming competition for students beginning studying IT, like me. The language could be chosen freely.
At this time, I had already done some C and PHP programming.. but I also had heard of Ruby and that Ruby is sooo cool. So I decided to learn the basics of Ruby by taking part… and it’s been the right decision! I fell in love with Ruby ;).
I publish my solution here. It is a good “try to understand what it does”-exercise for people new to Ruby or programming in general (or people doing Rails only all the time). […]
Create an offline version of the Ruby docs
When I began programming Ruby/Rails, I quickly found the online Ruby documentation at ruby-doc.org and the Rails API, which are both very useful. But unfortunately, one cannot be always online. In this blog post, I’ll demonstrate some ways to generate or get the docs offline and some hints on using them. […]
Converting decimal to binary integers: custom methods vs. to_i [Update]
At my last entry, a question arose about what is the most efficient way to convert integers between the bases 2 and 10: either using built-in ruby methods (and even do lightweight string-operations) or calculating it manually. I had to find out ;). So I have written a little benchmark program, which does the conversion in three different ways:
- using built-in to_i-magic
- calculating it by hand
- using sprintf
It stops the time each method needs to get the fastest. The result might be surprising. [Update: improved the custom methods] […]
Storing an array of indices in an integer
Sometimes you have an array of indices. These might, for example, act as flags, whether some specific options are set or not. A nice way to store this list is, to store it in one single number. […]
Discovering the world of Ruby
Welcome to the rbJ*_*L.net blog. This is a blog for Ruby fans by a Ruby fan ;). […]