Questions about Ruby, dynamic, reflective, general-purpose object-oriented programming language that combines syntax inspired by Perl with Smalltalk-like features.

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3
votes
1answer
301 views

How do I test this?

I've attempted test first in Ruby on Rails using Test Unit and RSpec. I'm wondering how to do test first in situations that are more closely tied to the OS/filesystem. Problem: Building a USB stick ...
2
votes
3answers
502 views

Is the Observer pattern adequate for this kind of scenario?

I'm creating a simple game development framework with Ruby. There is a node system. A node is a game entity, and it has position. It can have children nodes (and one parent node). Children are always ...
8
votes
3answers
347 views

Is there any situation in which it would be appropriate to use unless… else?

This construction is considered wrong unless #.. else #.. end This is for the general reason of double-negative confusions. It translates to: if not #.. if not not #.. end We all agree ...
1
vote
1answer
933 views

ruby-idiomatic hashes vs arrays

So I am still fairly new to ruby, though I have noticed that it is very hard to create 2d-array and that hashes seem to be more of the go to data structure than arrays. I was wondering why the Ruby ...
2
votes
1answer
198 views

How do I know when should I package my classes in Ruby?

In Ruby, I'm creating a small game development framework. Just some personal project - a very small group of friends helping. Now I am in need of handling geometric concepts. Rectangles, Circles, ...
0
votes
1answer
451 views

Algorithms for Data Redundancy and Failover for distributed storage system?

I'm building a distributed storage system that works with different storage sizes. For instance, my storage devices have sizes of 50GB, 70GB, 150GB, 250GB, 1000GB, 5 storage systems in one system. My ...
7
votes
2answers
261 views

How to share control of links/domains on an open source project with many collaborators?

I'm trying to help the Rebol project re-engineer its web presence now that it is open source as Apache 2 — after nearly two decades of proprietary license! The language's creator currently has ...
2
votes
0answers
125 views

How do I test my non-Ruby website using Ruby?

I would like to build some Ruby tests to test my non-Ruby website. I love the Ruby testing tools (webrat, capybara, etc.) but they seem to be targeted to testing local sites. How can I use these ...
2
votes
1answer
167 views

How do I distinguish between things belonging to the standard library, specific gems, and those that are user-generated in Ruby?

I'm a beginning programmer, that for various reasons is using an existing Ruby codebase to learn to program. My goal is to be able to understand and eventually extend this codebase. However, I find it ...
0
votes
2answers
204 views

Why there is much more support for closed xls format in rails (and ruby) than to an open ods format?

It is little depressive, but it seems to me that there is much more support for manipulating ugly proprietary closed format like xls in rails (and ruby) in general that to documented open Open ...
0
votes
1answer
560 views

Benefits of using XML builder vs templating language like ERB?

I'm doing a lot of work with XML, our legacy XML generators use the ruby template language ERB to create the XML files. I've been experimenting with Nokogiri and the builder model of creating XML, but ...
4
votes
1answer
201 views

Order collisions in ecommerce

Suppose I have a web app where sellers add their products and set them as available for sale. Then I show a list of products in my mobile app, where I get products via my REST API. My problem: suppose ...
1
vote
5answers
2k views

Why would you want to use an array, or hash as hash key in ruby?

i'm using Ruby 1.9.3 I figured out that you can use an array, or a hash as hash key in ruby: h = Hash.new h[Array.new] = "Why?" h[Array.new] # Output: "Why?" h[Hash.new] = "It doesn't make sense" ...
3
votes
2answers
381 views

Getting practicality of PHP from Ruby or Python

I have a rather odd problem. I love the practicality of PHP - specifically that I can fairly safely assume that on any random server I'll have access to the MySQL libraries, and that I can go between ...
2
votes
1answer
6k views

Why does gmail use java? Is there really a advantage over something like php or python? [closed]

Note: I know that none of you (probably) work for google, so this is a lot more of a conceptual question. So yeah, i discovered that Gmail uses java and that got me thinking, Why? I personally never ...
1
vote
4answers
591 views

Is there any situation when there's no alternative to instanceof?

It seems to me that instanceof comes from the land of functional programming and is a watered down version of pattern matching and that the OO altenative to it should be dynamic dispatching. In OO ...
3
votes
1answer
1k views

Is it possible to write a code without class methods, globals, and class variables? [closed]

I'm designing my own programming language for fun, and I'm thinking of making it fully Object-oriented (no statics, no globals, no class variables, no class methods), so I need to find a way to ...
3
votes
1answer
527 views

How does dependency inversion principle work in languages without interfaces?

In C#/Java, the dependency inversion principle is often demonstrated by high-level classes that depends on an interface/abstraction (that it owns). Low-level classes will implement the interface, thus ...
2
votes
1answer
319 views

Attempt at understanding the double-dispatch pattern

I've been trying to grok the double-dispatch pattern and having a hard time. I finally attempted a sample program to help myself understand. Here's the gist. But then I decided to attempt it without ...
9
votes
4answers
569 views

Is Non-Deterministic Resource-Management a Leaky Abstraction?

From what I can see, there are two pervasive forms of resource-management: deterministic destruction and explicit. Examples of the former would be C++ destructors and smart pointers or Perl's DESTROY ...
1
vote
1answer
224 views

Should an open source gem contain .rvmrc?

Using .rvmrc seems to be considered a best practice for apps. But should an open source gem contain .rvmrc in their source code on Github? I think it's not good to require everyone who wants to ...
2
votes
1answer
495 views

Ruby manager for Windows: Is Ruby's PIK alive or dying?

At first, please forgive probably offtopic and/or notconstructive question, but I truly have no idea where to ask it. At first I targetted StackOverflow there's at least some PIK-related traffic ...
1
vote
1answer
235 views

Building an RPC framework

I'm curious about what it takes to build a simple and robust RPC framework. I've only looked at a few ruby frameworks but they are all lacking in some way. What I want out of an RPC framework is some ...
2
votes
1answer
885 views

When can one call themselves a “Rubyist”? [closed]

I was wondering what that term even meant. Is it something to do with one's amount of knowledge about the Ruby language or just the plain idea of using it. When can one call themselves a "Rubyist"?
21
votes
5answers
1k views

How to avoid giant glue methods?

In my current job, I've been tasked with cleaning up old code a few times. Often the code is a labyrinth and the data behind it is even more tangled. I find myself combing out things into nice, neat,...
4
votes
3answers
300 views

Is there an idiom for a loop that executes some block of instructions between iterations? (In Ruby in particular)

I often need to do some operations in a loop and some other operations between the iterations. A simple example would be collecting words from an array into a string, spelled backwards and separated ...
1
vote
3answers
1k views

Setting up a simple Ruby\Rails environment

I am coming from a .NET background and beginning my journey into the Mac OSX\Ruby\Rails environment. A lot of the resources I have found such as this one have between 5-10 steps for setting up a Ruby\...
2
votes
2answers
347 views

How to fix bad fundamentals? [closed]

I am a native PHP developer, and have been for about a year or so. I love PHP and it was very easy for me to learn, but I have developed some bad habits along the way due to never having a formal ...
2
votes
1answer
615 views

Does it make sense to create a Ruby wrapper to reference a Java object that does exactly the same thing?

I am using JRuby. In my Java code, I have a class called Texture, capable of doing some graphic manipulation stuff. In my Ruby code, I will usually need to draw things, so though I should simply ...
4
votes
1answer
5k views

What is a closure and how is it implemented in Ruby?

In the context of the Ruby programming language, what is a closure and when do you use one? What are the uses for it in Rails?
6
votes
2answers
10k views

How to execute a Ruby file in Java, capable of calling functions from the Java program and receiving primitive-type results?

I do not fully understand what am I asking (lol!), well, in the sense of if it is even possible, that is. If it isn't, sorry. Suppose I have a Java program. It has a Main and a JavaCalculator class. ...
0
votes
3answers
264 views

Render Ruby object to interactive html

I am developing a tool that discovers network services enabled on host and writes short summary on them like this: init,1 └── login,1560 -- └── bash,1629 └── nc,12137 -lup 50505 { :...
0
votes
1answer
280 views

Should tests be in the same Ruby file or in separated Ruby files?

While using Selenium and Ruby to do some functional tests, I am worried with the performance. So is it better to add all test methods in the same Ruby file, or I should put each one in separated code ...
4
votes
1answer
1k views

combining ruby and C++

I've been discussing a conceptual project with a friend of mine and the the most effective way we've seen of doing it is writing the engine in C++ while the logic would be done in Ruby. However, we ...
8
votes
1answer
891 views

Classless tables possible with Datamapper?

I have an Item class with the following attributes: itemId,name,weight,volume,price,required_skills,required_items. Since the last two attributes are going to be multivalued, I removed them and ...
7
votes
6answers
1k views

Is it okay to define a [] method in ruby's NilClass?

Ruby by default does not include the method [] for NilClass For example, to check if foo["bar"] exists when foo may be nil, I have to do: foo = something_that_may_or_may_not_return_nil if foo &&...
1
vote
1answer
269 views

How do global cancel/exit commands work in bash?

As I have done multiple times before, I've written bash scripts, and just general commands that go nowhere. They just blink the little command line cursor at me for infinity until I control+C the ...
5
votes
3answers
729 views

What can procs and lambdas do that functions can't in ruby

I've been working in Ruby for the last couple weeks, and I've come to the subject of procs, lambdas and blocks. After reading a fair share of examples from a variety of sources, I don't how they're ...
1
vote
1answer
3k views

Ruby: how to step through ruby code [closed]

I'm trying to learn how to step through Ruby code (written by more experienced programmers) in order to improve my knowledge of Ruby. Problem is that I don't really know how to do it well. Googling ...
6
votes
2answers
1k views

How relevant is UTF-7 when it comes to parsing emails?

I recently implemented incoming emails for an application and boy, did I open the gates of hell? Since then every other day an email arrives that makes the app fail in a different way. One of those ...
1
vote
2answers
1k views

What is faster and preferable way for variable assignment in ruby? [closed]

I am a RoR developer and want to clarify some doubt about ruby variable assignment. In ruby we have two ways for variable assignment. str, arr, num = "Hi", [1, 2], 3 and str = "Hi" arr = [1, 2] ...
11
votes
3answers
21k views

Can we create desktop application with Ruby? [closed]

I know the Ruby on Rails framework is only for web development and not suitable for desktop application development. But if a ruby programmer wants to develop a desktop application, is it suitable and ...
4
votes
2answers
491 views

Should I prefer instance methods over class methods in Ruby?

I'm working on a rails application, and I've been pulling functionality out of my rails code and into pure ruby classes in lib/. I've found myself often writing classes like this: class ...
1
vote
2answers
1k views

Is it worth converting a Django project to Rails?

I have a project I shelved a while back- it was essentially a working web app built in django but I stopped working on it to work on something else. I plan on starting it up again in my spare time, ...
1
vote
2answers
1k views

How do I read API documentation? [closed]

I've been trying to read through the RoR API to try to learn things that the tutorial missed, and I haven't been able to follow it at all. The only time I've read documentation was when I needed to ...
2
votes
3answers
346 views

What is a legitimate reason to use Cucumber?

I've worked in several contracts where the client used Cucumber and I've often felt that the testing suite didn't really have a place in our stack. From what I understand, business analysts/non-...
1
vote
3answers
279 views

Ruby/RoR development: desktop or server [closed]

Our company has started development of own systems "in-house". We already got couple of developers, who will be responsible for writing code in Ruby/RoR. We are currently discussing infrastructure, ...
3
votes
1answer
235 views

Is it possible to use RubyGnome2's/QtRuby's HTML renderers to make UI for a Ruby script?

I'd like to make a graphical user interface for my script, instead of running it from the console. I'm aware there's a wealth of UI libraries for Ruby, but I'm quite familiar with HTML and CSS and I'd ...
5
votes
7answers
12k views

How much Ruby should I learn before moving to Rails? [closed]

Just a quick question.. I can never get a definitive answer when googling this, either. Some people say you can learn Rails without knowing any Ruby, but at some point you'll run into a brick wall and ...
37
votes
9answers
8k views

Explanation on how “Tell, Don't Ask” is considered good OO

This blogpost was posted on Hacker News with several upvotes. Coming from C++, most of these examples seem to go against what I've been taught. Such as example #2: Bad: def check_for_overheating(...