Working with Ruby
Occasional blog posts about Ruby updates, tools, editor tweaks, and random snippets. You might also be interested in my newer project that docuements lesser-known features in Ruby: Idiosyncratic Ruby.

Ruby and Random

Wrongly used randomness can be the source of hard-to-detect bugs and security holes. This is relevant every time you use randomness, for example, when implementing an existing protocol/interface that requires random values or generating tokens for your next raffle. This article describes when to use which of Ruby’s randomness methods.

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Things I learned while implementing version 1.0 of pws

After releasing version 0.9 of my cli password manager, I received friendly feedback and suggestions, which encouraged me to further improve it. Here are some of my experiences implementing pws 1.0:

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pws: The ruby-powered command-line password manager

  • stores your passwords in a file on your disk
  • encrypts the file with a master password
  • is designed for every-day-use
  • is written in 234 lines of understandable Ruby code… Read it!
  • is tested with 222 Cucumber steps

Why you should switch to 1.9: Three Ruby 1.8 bugs

Ruby 1.8 dies in June 2012. This post shows some small examples, why this is good ;)

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Pass multiple blocks to methods using named procs

My codebrawl entry (gist) got the 5th place (out of 20). Want to use it in real life :)

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Project Euler 19, 20, 21, 22, 23, 24, 25 (Ruby)

The next pack of Project Euler solutions.

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Do you know the official Ruby interpreter "goruby"?

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New features of Ruby Zucker version 2 and 3

The Zucker gem has gotten some new features. Installation is as easy as
 gem install zucker
and
 require 'zucker/all'

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Introducing Ruby Zucker - a new syntactical sugar gem

Zucker is a collection of lightweight scripts (cubes) that make Ruby even more beautiful: rubyzucker.info

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Project Euler 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18 (Ruby)

More solutions for the projecteuler.net problems. Some of them are solved using 1.9.2 features.

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New Array and Enumerable methods in Ruby 1.9.2: keep_if, chunk...

In Ruby, dealing with Arrays and similar objects is pretty fun. And we have gotten more possibilities with Ruby 1.9.2 :)

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RubyBuntu -2- Troubleshooting common Ruby ubuntu problems

A common Ruby experience on ubuntu: You get some stupid error, saying something would be missing – and you don’t know what to do…

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RubyBuntu -1- Installing Ruby (and Rails) on ubuntu

Installing Ruby/Rails on ubuntu is not hard, but some little obstacles might be confusing.

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Project Euler 1-5 (Ruby)

projecteuler.net tries to get you thinking about how to solve mathematical problems by programming. Here are the first five problems, solved in Ruby, including comments.

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Oh, this sweet and tasty syntactic sugar!

This article is written for people with experience in programming in general, but who are new to Ruby.
A German version is published in the offline magazine #2, a magazine by some students of TU Dresden.

The intention is to demonstrate some features of Ruby and show, what is so great about Ruby:

A clean syntax combined with the possibility to adapt the language to given requirements flexibly.

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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).

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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:

  1. using built-in to_i-magic
  2. calculating it by hand
  3. using sprintf

It stops the time each method needs to get the fastest. The result might be surprising. [Update: improved the custom methods]

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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.

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