Why Ruby makes my heart go Boom Boom

Why Ruby makes myheart go Boom Boom Anton Lindqvist anton@qvister.se @mptre

BackgroundCreated by Yukihiro "Matz" Matsumoto.Released in 1993.Revival in ~2005 with Ruby on Rails.Inspired by Perl, Lisp, Smalltalk andPython.One man’s strive for perfection.

human > computer

Readable10.times { puts "Hello World!" }redirect_to "/login" unless @user.logged_in?

Closer to human thought“It feels much closer to mythought process. It feels like Imexpressing exactly what I want tosay in code without translatingit.”David Heinemeier Hansson

Everything _is_ an object

Put the object straight10.times { puts "Hello World!" }

Put the objectobjec straight t 10.times { puts "Hello World!" }

Put the objectobjec straight method t 10.times { puts "Hello World!" }

Put the objectobjec straight method t 10.times { puts "Hello World!" } class Integer < Numeric def times # do awesome stuff end end

Monkey patching“A monkey needs to patch and so do you.”

“Modify or extend code at runtime.”

UpsideReadability and semantics.Like the fact that it’s possible.Accessing the Reddit example.

Upside Readability and semantics. Like the fact that it’s possible. Accessing the Reddit example.class Array def forty_two self[41] endend

ExampleImplementing Swatch Internet Time toexisting time class.Both in PHP and Ruby.

PHP<?phpclass DateTime { public function internetTime() { return ((($this->getTimestamp() + 3600) % 86400) / 86.4); }}

PHP<?phpclass DateTime { public function internetTime() { return ((($this->getTimestamp() + 3600) % 86400) / 86.4); }}PHP Fatal error: Cannot redeclare class DateTime

One more time<?phpclass MyDateTime extends DateTime { function internetTime() { return ((($this->getTimestamp() + 3600) % 86400) / 86.4); }}

Rubyclass Time def internet ((self.to_i + 3600) % 86400) / 86.4 endend

Syntax“All the small things. True care. Truth brings.”

Unless a real beauty Well needed conditional statement.

Unless a real beauty Well needed conditional statement.if !@user.logged_in? redirect_to "/login"end

Unless a real beauty Well needed conditional statement.if !@user.logged_in? redirect_to "/login"endunless @user.logged_in? redirect_to "/login"end

Statement modifiersMove control structures to the end ofan expression.

Statement modifiers Move control structures to the end of an expression.unless @user.logged_in? redirect_to "/login"end

Statement modifiers Move control structures to the end of an expression.unless @user.logged_in? redirect_to "/login"endredirect_to "/login" unless @user.logged_in?

BlocksJust like closures in JavaScript.You’ve already seen at least oneblock. Remember?

Blocks Just like closures in JavaScript. You’ve already seen at least one block. Remember?10.times { puts "Hello World!" }

Blocks Just like closures in JavaScript. You’ve already seen at least one block. Remember?10.times { puts "Hello World!" }10.times do puts "Hello World!"end

Excellent example

Excellent exampleUser.create(:username => "mptre", ↩:first_name => "Anton", ↩:sur_name => "Lindqvist")

Excellent exampleUser.create(:username => "mptre", ↩:first_name => "Anton", ↩:sur_name => "Lindqvist")User.create do |user| user.username = "mptre" user.first_name = "Anton" user.sur_name = "Lindqvist"end

Optional return statement

Optional return statementdef foo return "bar"endputs foo# => "bar"

Optional return statementdef foo return "bar"endputs foo# => "bar"def foo "bar"endputs foo# => "bar"

Yet another exampleclass Integer < Numeric def one_more_time self + 1 endendputs 1.one_more_time# => 2

Gems“Small packages stuffed with awesomeness.”

GemsDistributed package manager.Similiar to PEAR.Awesome community.High quality.

Usage example

Usage example# gem install nokogiri

Usage example# gem install nokogirirequire "net/http"require "rubygems"require "nokogiri"url = "http://www.improove.se/feed/"feed = Nokogiri::XML( ↩Net::HTTP.get_response(URI.parse(url)) ↩)

Worth mentioningEven Ruby on Rails is distributed asa gem.

Worth mentioning Even Ruby on Rails is distributed as a gem.# gem install rails

Testing“Assert works like a charm.”

Unit tests for presidentTesting is serious biz.Standarized methodology in the worldof Ruby.TDD (Test Driven Development)Loads of tools: Cucumber, RSpec andshoulda.

Examplerequire minitest/specdescribe Meme do before do @meme = Meme.new end describe "when asked about cheeseburgers" do it "should respond positively" do @meme.i_can_has_cheezburger?.must_equal "OHAI!" end endendBorrowed from Mike Perham.

One more thing...

Ruby 1.9“The beat goes on.”

Default arguments at the beginning of a method

Default arguments at the beginning of a methoddef foo(a = 1, b) [a, b]end

Default arguments at the beginning of a methoddef foo(a = 1, b) [a, b]endputs foo(2)# => [1, 2]

Default arguments at the beginning of a methoddef foo(a = 1, b) [a, b]endputs foo(2)# => [1, 2]puts foo(3, 2)# => [3, 2]

Named captures in regex

Named captures in regex# ruby 1.8puts "Hello 2011!".match(/(d+)/)[0]# => "2011"

Named captures in regex# ruby 1.8puts "Hello 2011!".match(/(d+)/)[0]# => "2011"# ruby 1.9puts "Hello 2011!".match(/(?<year>d+)/)[:year]# => "2011"

Compact hash syntax

Compact hash syntax# ruby 1.8foo = {:a => 1, :b => 2}

Compact hash syntax# ruby 1.8foo = {:a => 1, :b => 2}# ruby 1.9foo = {a:1, b:2}

Compact lambda syntax

Compact lambda syntax# ruby 1.8foo = lambda {|a,b| [a, b] }puts foo.call(1, 2)# => [1, 2]

Compact lambda syntax# ruby 1.8foo = lambda {|a,b| [a, b] }puts foo.call(1, 2)# => [1, 2]# ruby 1.9foo = -> a,b { [a, b] }puts foo.call(1, 2)# => [1, 2]

Presentation.punchline unless Audience.convinced?

Referenceshttps://github.com/bblimke/copy-with-style-tmbundlehttp://en.wikipedia.org/wiki/Ruby_(programming_language)http://bigthink.com/ideas/21597http://stackoverflow.com/questions/394144/what-does-monkey-patching-exactly-mean-in-rubyhttp://www.reddit.com/r/ruby/comments/823os/rails_core_has_a_method_for_accessing_the_reddit/http://beust.com/weblog2/archives/000387.htmlhttp://ruby-toolbox.com/categories/testing_frameworks.htmlhttp://www.bootspring.com/2010/09/22/minitest-rubys-test-framework/http://www.igvita.com/2011/02/03/new-ruby-19-features-tips-tricks/

Thanks!Anton Lindqvist@mptreanton@qvister.se

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Why Ruby makes my heart go Boom Boom

by mptre on Feb 18, 2011

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Why Ruby makes my heart go Boom Boom — Presentation Transcript