Try this: CSV.open(“data.csv”, “wb”) do |csv| @data.each do |hash| csv << hash.values end end If you want the first line of the CSV to contain the keys of the hash (a header row), simply do: CSV.open(“data.csv”, “wb”) do |csv| csv << @data.first.keys # adds the attributes name on the first line @data.each do |hash| csv … Read more
I’ve done pretty extensive development in Ruby and Groovy (as well as a little Jython using Grinder as a load testing tool). Of the 3, I prefer Groovy the most. I like the closure syntax the best and I think that it has the tightest integration in how it works with other java classes on … Read more
The answer to this question is going to depend on how you want to deploy this app. Do you want it running completely on the phone or can it be a web app disguised as an iphone/android app? For the native app solution I’d checkout the Rhodes Framework. It’s not RoR but you’ll see that … Read more
Scala is “scalable” in the sense that the language can be improved upon by libraries in a way that makes the extensions look like they are part of the language. That’s why actors looks like part of the language, or why BigInt looks like part of the language. This also applies to most other JVM … Read more
I believe you can check the RUBY_PLATFORM constant.
Ruby runs within a native C based interpreter. JRuby runs inside the Java Virtual Machine. There are many gems and plugins that might not work inside JRuby, specifically one’s with native C extensions, unless they’ve been rewritten to run in Java. Ultimately the difference comes in when you want to actually deploy your application (assuming … Read more
Regarding to rspec issues (https://github.com/rspec/rspec-rails/issues/360) you should put config.include Capybara::DSL in spec_helper.rb, inside the config block.
With ANT: Download JRuby complete jar file (JRuby Complete jar download page) Download the latest HAML/SASS code (HAML/SASS tarball), and extract it. Put it in “/libs/sass-[VERSION]” Add the following to an ant build file. Replace [VERSION] in the script to the corresponding versions of JRuby and SASS Run the ant script, and the sass or … Read more
Use the JRUBY_OPTS environment variable. JRUBY_OPTS holds a list of arguments that are added to any arguments specified on the command line. For example (on Linux): $ jruby -v jruby 1.6.0.RC1 (ruby 1.8.7 patchlevel 330) (2011-01-10 769f847) (Java HotSp… $ export JRUBY_OPTS=–1.9 $ jruby -v jruby 1.6.0.RC1 (ruby 1.9.2 trunk 136) (2011-01-10 769f847) (Java HotSpot(TM… … Read more
JRuby is the Ruby implementation that runs on a JVM whereas Matz’s Ruby is a C implementation. Key features to note are: JRuby runs on Java VM’s and it’s either compiled or interpreted down to Java byte code. JRuby can integrate with Java code. If you have Java class libraries (.jar’s), you can reference and … Read more