Scala vs ruby
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- Ruby and Scala both provide object oriented and functional programming capabilities but Scala aims to have better performance than Ruby while providing less ceremony than Java. - Both languages have vibrant communities and encourage testing, but Scala emphasizes letting the compiler do more work and provides concurrency features while Ruby emphasizes flexibility, elegance and fun. - Common tasks like routing, templates, unit tests and specs are similar between Rails and Play frameworks for Ruby and Scala respectively, though Ruby uses more optional conventions while Scala requires more strict conventions.
![Unit Tests
test 'my test' do
array = [1, 2, 3]
assert_equal 1, array.first
end
@Test def myTest {
val array = List(1, 2, 3)
assert(array(0) === 1)
}](https://image.slidesharecdn.com/scalavsruby-150311032828-conversion-gate01/85/Scala-vs-ruby-17-320.jpg)
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Scala vs ruby
- 1. – Martin Mazur: http://youtu.be/FPBVxpl8NMo @ DevDay “Why you should talk to strangers?”
- 2. Ruby vs Scala • Designed for humans, not machines • Extreme flexibility: if you mess up, it’s on you • Everything has to be easy, elegant and fun • DSL on top of DSLs on top of DSLs • Testing is critical • Things move quickly, learn to keep up • Passionate and vibrant community • Have the best of both object oriented and functional programming worlds • Let the compiler do some of the work for you • Concurrency matters • Less ceremony than Java, but aiming for same or better performance • Live in harmony with the Java ecosystem
- 3. Installation brew install ruby brew curl -sSL https://get.rvm.io | bash -s stable ruby or brew install scala or curl -O http://downloads.typesafe.com/scala/2.11.7/scala-2.11.7.tgz | tar -xvf -
- 4. Packages addSbtPlugin("com.typesafe.play" % "sbt-plugin" % "2.2.7") build.sbt (obligate versioning) sbt compile gem 'rails', '~> 5.0.0' Gemfile (optional versioning) + Gemfile.lock (locked versions) bundle
- 11. monkey_patching
- 12. mixins
- 13. Rails vs Play!
- 14. Boilerplate rails new example play new example
- 15. Routing get '/clients/all', to: 'clients#index' get '/clients/:id', to: 'clients#show' root 'application#home' GET /clients/all controllers.Clients.index() GET /clients/:id controllers.Clients.show(id: Long) GET / controllers.Application.home()
- 16. Templates <ul> @(3 times) { <li>list item</li> } </ul> // Scala Template Engine <ul> <% 3.times do %> <li>list item</li> <% end %> </ul> # Embedded Ruby
- 17. Unit Tests test 'my test' do array = [1, 2, 3] assert_equal 1, array.first end @Test def myTest { val array = List(1, 2, 3) assert(array(0) === 1) }
- 18. Specs describe 'HelloWorld spec' do context "The 'Hello world' string should" do it 'contain 11 characters' do 'Hello world'.size.should be 11 end it "end with 'world'" do 'Hello world'.should end_with('world') end end end class HelloWorldSpec extends Specification { "The 'Hello world' string" should { "contain 11 characters" in { 'Hello world' must have size(11) } "end with 'world'" in { 'Hello world'.should end_with('world') } } }
- 19. JSON rendering def index render json: { message: 'Hello world' } end def index = Json("{message: 'Hello world'}")
- 20. Documentation