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. […]
Ruby’s structs are one of my favorite data types in Ruby. They help you to keep some defined structure in the dynamic world of Ruby. Often, it makes sense to use them instead of hashes or arrays. Read-only structs take the idea a level further. […]
So you’ve installed (or upgraded to) ubuntu 11.10 and everything looks great… Except – uh!, lots of gedit plugins are only compatible with gedit 2! But don’t be sad.. or angry.. This guide points out, how to, nevertheless, create a solid foundation that allows you getting prodcutive with gedit! […]
I am using the Jekyll blog generator for some projects (still not sure if I really like it..) and came across the following requirement the other day:
- The blog should only have an index page, no (visible) sub-posts
- This index page should use pagination
- There should be the ability to link to a specific blog post
The problem was: I wanted to use anchor links (http://some.url/#post-identifier), but – because of the pagination – blog posts “change” their index page (e.g. in jekyll, they move from
Rails migrations are easy to understand and easy to write. However, you can save some unnecessary key strokes by applying these three tips :) […]
puts is great for a quick output, but when a script gets more complex or you want to offer a flexible executable, consider using the logger ;). Since the logger class is part of the Ruby standard library, it can be used everywhere, without installing any gems. And it’s very easy to use :D […]
Somehow, I stumbled upon this useful little script by _why: Update […]
Hirb: “A mini view framework for console/irb that’s easy to use, even while under its influence. Console goodies include a no-wrap table, auto-pager, tree and menu.” now supports unicode in two ways:
│ Support for unicode full-width characters │ Unicode table characters instead of +/- chars │
.gemspec file of a gem allows to specify requirements for that gem – but usually you do not get to see them. These five lines patch RubyGems, so that
gem displays the requirements of a gem after it has been installed: […]
Not everyone likes debuggers. I rather print the debug values myself – it works and I do not need to learn a debugger :P […]
One of my favourite ways of learning something about existing code is to load it into irb and play around with it. You are able to ask every object in irb what it can do. It is as easy as you just asking for
public_methods and the object will show its abilities. But often you get spammed by
Object or irb methods that you rarely want to use. […]
One useful (and funny) feature of Ruby is the
Symbol#to_proc method that lets you write concise code like this:
%w|1 2 3 4|.map(&:to_i). Almost everyone who knows this feature loves it ;). However, the use cases are pretty limited, because in most cases you need to pass parameters! […]
In Ruby, dealing with Arrays and similar objects is pretty fun. And we have gotten more possibilities with Ruby 1.9.2 :) […]
Transferring an existing project to Rails 3 is not that hard, but it usually cannot be done in 5 minutes. […]
You can, of course, use an IDE for coding – but reconsider it: After hours of initialization, it tries to do everything for you… Somewhere in the never ending menu jungle… And you need to click all the time… Stop! Focus on the gist! You want to write code! […]
Most Ruby programmers know: Many things can be done in much less time on the command line. To become more productive, you should take the 10 minutes to configure some basic settings. […]
A common Ruby experience on ubuntu: You get some stupid error, saying something would be missing – and you don’t know what to do… […]
After editing some source files with different editors on different platforms, I had some troubles with automatically inserted tabs messing it all up.
This little script replaces all tabs with two spaces. […]
Lots of IDEs (e.g. Netbeans) and some editors (e.g. gedit with plugins) have a nice feature: They show comments, which start with something like TODO or FIXME. Those annotations are quickly written and they make it harder to forget some things you wanted to (or have to) do.
I have just discovered that Rails has this feature already built-in!
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. […]
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 :) […]
In my current Rails project, I use the aegis gem for rights management. And I almost got mad, wondering, why it wouldn’t work.. […]
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. […]