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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1
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0answers
312 views

Run RSpec from within a ruby script while refreshing all ruby configs etc

I'm working with a very large project with tons of established tests that include some reasonably complicated environment setups and what not. I've recently run into a situation testing some ...
9
votes
2answers
393 views

Why don't Python and Ruby make a distinction between declaring and assigning a value to variables?

Two of the most popular dynamically typed scripting languages, Python and Ruby, do not make a distinction in syntax between the declaration of a variable and assignation of a value to it. That is in ...
34
votes
2answers
5k views

Do modern languages still use parser generators?

I was researching about the gcc compiler suite on wikipedia here, when this came up: GCC started out using LALR parsers generated with Bison, but gradually switched to hand-written recursive-...
0
votes
1answer
350 views

Refactoring a Single Rails Model with large methods & long join queries trying to do everything

I have a working Ruby on Rails Model that I suspect is inefficient, hard to maintain, and full of unnecessary SQL join queries. I want to optimize and refactor this Model (Quiz.rb) to comply with ...
3
votes
2answers
714 views

What kind of exception to ask for out of range arguments?

What type of exception should I throw? I have a console class which describes rectangle of cells which a user can index by passing in a coordinate: width, height = 80, 25 console = Console.new(width,...
1
vote
3answers
619 views

How can I rank teams based off of head to head wins/losses

I'm trying to write an algorithm (specifically in Ruby) that will rank teams based on their record against each other. If a team A and team B have won the same amount of games against each other, then ...
0
votes
1answer
197 views

Android -> Ruby Server Interface -> Mongodb

I've been wrecking my brain about this for a few days. I'll run my scenario by you and hopefully you can help me. In my head this is how it goes: I have an Android App. I want my Android App to make ...
1
vote
2answers
5k views

Why doesn't Ruby have implicit conversion of Fixnum into String?

Ruby normally makes things easy. However, it doesn't allow implicitely converting a number to a string: 2.0.0p247 :010 > "a"+1 TypeError: no implicit conversion of Fixnum into String Why is this ...
4
votes
1answer
181 views

What does it mean that file IO binary flag is only relevant on Windows

I was reading a question and one of the comments mentioned that "The binary flag is only relevant on Windows". Given the context of the question and answer, I interpret this statement as on non-...
2
votes
5answers
336 views

What happened to VM based deployments?

Watched some MountainWest RubyConf 2014 talks and noticed an interesting theme. Many dynamic programming environments back in the old days used to be self-contained VM images, e.g. SmallTalk, GemStone/...
-1
votes
1answer
297 views

Is there a purely technical term for 'monkey patching' [closed]

EDIT The original title of the question was Is there a non-derogatory term for 'monkey patching'. As I have learned that the term is actually not derogatory, or is at least not meant to be, I changed ...
0
votes
1answer
296 views

JSON - Ruby objects key naming [closed]

Ruby object has method/property: def tentakles_count 8 end JavaScript object has key/property: { justEnough: true } Now, when JavaScript gets serialised ruby object via XHR or WebSocket, ...
2
votes
2answers
261 views

Need advice on design in Ruby On Rails

For personal educational purposes I am making a site for a conference. One of the object that exist in a conference is a session, which has different states and in each state it has slightly different ...
2
votes
2answers
124 views

How to check robustness in a service that includes multiple points of failure in workflow, including FTP

As part of my workflow, I need to do all these steps in one transaction - I need to ftp files to 2 different FTP servers. - There is also a spreadsheet that gets generated which needs to be FTP'ed. ...
2
votes
4answers
653 views

Test Doubles, Mocks and Stubs - when not to use & why, for Ruby, Rspec

I've learned about mocking and stubbing and I've seen how they can help me create great test suites that run blindingly fast and thus speed up my development process hugely. However I've also seen ...
-2
votes
1answer
8k views

Advantages and disadvantages of PHP/Ruby [closed]

I've been a front-end developer for about two years now, and I'm attempting to break into the server side of things. Ideally I'd like to work for a startup social network on the back-end side so I ...
2
votes
2answers
163 views

Auxiliary space complexity of map vs map!

I'm curious about the difference in space complexity between map and map! in ruby. If I have the methods: def mult_by_two(arr) arr.map {|i| i * 2 } end def mult_by_two!(arr) arr.map! {|i| i * 2 ...
34
votes
11answers
5k views

Is it okay to make coding style changes on an open source project that doesn't follow best practices?

Recently, I came across a number of open source Ruby (or majority of it was Ruby) projects on GitHub that when checked with a code analyzing tool like Rubocop, create a lot of offenses. Now, most of ...
2
votes
1answer
71 views

scoping concern when dealing with coupling

I'm learning ruby (and OOP in the process) and I find keep having to write the same patterns when logging progress so I want to wrap this up in a logging library that my other code can then just pass ...
0
votes
6answers
687 views

How do I explain a ruby method with a real-world analogy? [closed]

I am looking for a good analogy to help the concept of a method in ruby stick in my head. When I truly understand a concept, an image flashes in my mind that relates something physical to the abstract ...
0
votes
0answers
956 views

Ruby module namespacing advice

in my current project have: module Stats class Site ... end class Product def initialize(product_id) @product_id = product_id end end class Profile ... end end ...
1
vote
2answers
192 views

In Ruby, change global in thread safe block

In Ruby, I have a use case for a few common configuration options, e.g. NOOP, TRACE, SILENT. Right now I am using local vars instead of globals and passing them around all over the place and it's a ...
0
votes
1answer
831 views

ruby for desktop app or web app development [closed]

i am a beginner to ruby . i just did some minor research about why RUBY ? why choose RUBY ? whats new in it. Whenever i do type in a word RUBY in google search there comes a suggestion like RUBY on ...
19
votes
3answers
2k views

Why do so many languages treat numbers starting with 0 as octal?

I've read Where are octals useful? and it seems like octals are something that were once upon a time useful. Many languages treat numbers preceding with a 0 as octal, so the literal 010 is actually 8....
2
votes
1answer
144 views

How to create html pages which don't change very much and not very often?

I have a Rails server that connects to a json API on another server to get data to build the pages dynamically. These pages, however, don't change very much and not very often. I was thinking I could ...
2
votes
1answer
118 views

Should I use the new method/action to retrieve records? (Rails)

I have an admin controller that is just used for its index action which renders a view with the most recent updates to certain resources: class AdminController < ApplicationController ...
-1
votes
2answers
261 views

Programming beginner: Options for small program interfaces? [closed]

I have been a Rails developer for a year now, and I really want to start diving in to Ruby and pure programming without using a framework. However I am having trouble conceptualizing little programs I ...
4
votes
3answers
231 views

Is there a reason for the crossover from the Ruby community to the Clojure Community?

When we look at the the overlap between the Ruby Community - we see the following overlaps: Think Relevance (now Cognitect) has switched from Ruby to Clojure Jay Fields has switched from Ruby to ...
0
votes
2answers
426 views

help me understand Rails and attributes as class methods

This is from the Hartl Rails tutorial. We are automatically logging in a user in the process of creating that user with a callback to #create_remember_token. It works great but there are some things, ...
5
votes
2answers
565 views

Is using static-typing the solution to domain-driven design and decreasing the number of errors?

We are using PHP (a dynamically-typed language) in our project. However, I have found my colleagues asking questions such as http://stackoverflow.com/questions/20438322/modeling-a-binary-relationship-...
2
votes
3answers
451 views

How do I set up pairing email addresses?

Our team uses the Ruby gem hitch to manage pairing. You set it up with a group email address (e.g. dev@mycompany.com) and then tell it who is pairing: $ hitch james tiffany Hitch then sets your Git ...
4
votes
1answer
1k views

Is there a representation for mixins or traits on UML?

Is there a representation for modern programming constructs that are becoming common in modern OOP/hybrid languages like mixins/traits/categories/partial classes ?
0
votes
1answer
212 views

Refactoring this code that produces a reverse-lookup hash from another hash

This code is based on the idea of a Form Object http://blog.codeclimate.com/blog/2012/10/17/7-ways-to-decompose-fat-activerecord-models/ (see #3 if unfamiliar with the concept). My actual code in ...
1
vote
1answer
152 views

Inherit one instance variable from the global scope

I'm using Curses to create a command line GUI with Ruby. Everything's going well, but I have hit a slight snag. I don't think Curses knowledge (esoteric to be fair) is required to answer this question,...
7
votes
2answers
5k views

Ruby - when to use instance variables vs parameters between methods?

I'm writing several methods that call other methods. To pass the information I have a couple of choices: Pass the information as parameters Set instance variables so that other methods can access ...
2
votes
1answer
681 views

Rails: Useful example of delegate and Law of Demeter

I am currently learning about delegate and the Law of Demeter. I understand the Law of Demeter, but I can't seem to find a good example of where using delegate to avoid breaking the law would actually ...
5
votes
2answers
894 views

Why does Clojure neglect the uniform access principle?

My background is Ruby, C#, JavaScript and Java. And now I'm learning Clojure. What makes me feel uncomfortable about the later is that idiomatic Clojure seems to neglect the Uniform access principle (...
3
votes
2answers
613 views

Why does assigning a variable to false return false?

Why does: something = false always return false? Since it is an assignment and not a comparison, it seems it would make more sense to return the result (success/failure) of the assignment (like ...
3
votes
1answer
535 views

What do goroutines, Ruby Fibers, etc. look like to the OS/Kernel?

In process concurrency and thread concurrency it's quite obvious how the kernel sees these as they map directly to real things that the kernel manages. When it comes to Golang goroutines and Ruby ...
1
vote
1answer
1k views

Use ruby's array sort() method, or add items in correct place with a binary lookup?

If I am loading a whole load of items (un-ordered words from a file or something) would it be more efficient to load them all to a Ruby array, and then use the built in sort! method or to do a binary ...
9
votes
1answer
8k views

Why did Microsoft abandon IronRuby and IronPython? [closed]

Several years ago, Microsoft announced that Ruby and Python were coming to .net. The projects were called IronRuby and IronPython, respectively. Microsoft said that the projects would be built on ...
1
vote
4answers
276 views

Until what point should I refactor? [duplicate]

What do you think until what point should a programmer refactor the code? Basically having def method do_something end Pieces of code would be handy, but they increase spaghetti code until the ...
5
votes
3answers
2k views

How can web development bootcamps deliver on their promise? [closed]

I came across the concept of web development bootcamps, these 9-10 week intensive crash courses claim to teach beginners web development and help them get 80k starting salary jobs. Many of you might ...
2
votes
1answer
122 views

Storing different algorithms and using them for demonstration

I have an app for creating simple graphs (the kind with vertices and edges) and then using different algorithms on them (BFS, DFS, topsort, Prim's etc) for demonstrating how they work. I'm now ...
2
votes
2answers
115 views

Should I put the datatype of a class attribute in its name?

Most of my system's class attributes are just text, but in this case it makes more sense to place this particular class's attributes into one single hash (from a "keep the source code pretty" aspect). ...
7
votes
2answers
2k views

Is it considered bad practice to compile into Javascript as a matter of language preference? [closed]

I understand that compiling into Javascript is sometimes necessary and even in some cases results in a faster application. However I'm wondering if compiling into Javascript, for building web ...
1
vote
4answers
317 views

Efficient way of evaluating an array of strings then add to an array in Ruby

I am looking for an efficient way of evaluating an array of strings against a series of rules and then adding them to another array. For example I have an array of strings: something a 1234 #gohere ...
1
vote
2answers
707 views

Ruby: Multithreading a CSV with output

I have a script written in Ruby that has maxed out a core in my server's Xeon processor for the last 2 hours. Since it's currently only using 1 of four possible cores, I want to try and rewrite the ...
2
votes
3answers
1k views

What to use in UML for included module in ruby?

I like to create simple class diagrams for my projects. Most of the time I just use composition, inheritence and associations. IMB's basic UML resource tells all about this. However I'm using ruby so ...
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 ...