Web in the cloud with ruby

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Web in the Cloud with Ruby Monday, October 15, 12

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Rafael Macedo @macedorafael github.com/rafaelmacedo Monday, October 15, 12

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Ruby é... uma linguagem dinâmica, interpretada, e open source com foco em simplicidade e produtividade. Possui uma sintaxe elegante que é natural de ler e fácil de escrever. http:/ /ruby-lang.org/en Monday, October 15, 12

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Ruby é... “Eu queria uma linguagem que fosse mais poderosa que o Perl e mais orientada a objetos do que o Python.” Yukihiro “Matz” Matsumoto Monday, October 15, 12

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smalltalk python eiffel lisp perl Monday, October 15, 12

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Como aprender??? Monday, October 15, 12

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http:/ /www.ruby-lang.org/en Monday, October 15, 12

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http:/ /www.ruby-doc.org Monday, October 15, 12

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http:/ /www.rubydoc.info Monday, October 15, 12

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http:/ /api.rubyonrails.org Monday, October 15, 12

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http:/ /guides.rubyonrails.org Monday, October 15, 12

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http:/ /stackoverﬂow.com/search?q=ruby+rubyonrails Monday, October 15, 12

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http:/ /git-scm.com http:/ /try.github.com http:/ /github.com Monday, October 15, 12

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http:/ /git-scm.com http:/ /try.github.com http:/ /github.com Monday, October 15, 12

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http:/ /google.com Monday, October 15, 12

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http:/ /google.com FTW!!!! Monday, October 15, 12

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Por que Ruby??? Monday, October 15, 12

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~ 1 milhão de desenvolvedores 4M até 2013 (Gartner) Monday, October 15, 12

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• 112 bibliotecas 100% documentadas • Comunidade ativa • Diversos tutoriais e em diversos níveis • Bibliotecas em ruby são empacotadas e distribuidas como gems Documentação Monday, October 15, 12

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Rubygems Monday, October 15, 12

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Rubygems + 40K gems Monday, October 15, 12

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Rubygems + 40K gems 62.837 users Monday, October 15, 12

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Github Monday, October 15, 12

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Sintaxe elegante e limpa • dasdasdasd 1 def say_good_morning(name) 2 return "Good morning " + name + "!!!" 3 end 4 5 puts say_good_morning("folks") 6 >> Good morning folks!!! Monday, October 15, 12

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• dasdasdasd 1 def say_good_morning(name) 2 return "Good morning " + name + "!!!" 3 end 4 5 puts say_good_morning("folks") 6 >> Good morning folks!!! opcionais Sintaxe elegante e limpa Monday, October 15, 12

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• dasdasdasd 1 def say_good_morning(name) 2 return "Good morning " + name + "!!!" 3 end 4 5 puts say_good_morning "folks" 6 >> Good morning folks!!! Sintaxe elegante e limpa Monday, October 15, 12

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• dasdasdasd 1 def say_good_morning(name) 2 return "Good morning " + name + "!!!" 3 end 4 5 puts say_good_morning "folks" 6 >> Good morning folks!!! retorno automático Sintaxe elegante e limpa Monday, October 15, 12

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• dasdasdasd 1 def say_good_morning(name) 2 "Good morning " + name + "!!!" 3 end 4 5 puts say_good_morning "folks" 6 >> Good morning folks!!! Sintaxe elegante e limpa Monday, October 15, 12

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• dasdasdasd 1 def say_good_morning(name) 2 "Good morning " + name + "!!!" 3 end 4 5 puts say_good_morning "folks" 6 >> Good morning folks!!! interpolação Sintaxe elegante e limpa Monday, October 15, 12

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• dasdasdasd 1 def say_good_morning(name) 2 "Good morning #{name}!!!" 3 end 4 5 puts say_good_morning "folks" 6 >> Good morning folks!!! Sintaxe elegante e limpa Monday, October 15, 12

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Orientada a objetos 1 "some dummy text".class 2 >> String 3 4 1.class 5 >> Fixnum 6 7 true.class 8 >> TrueClass 9 10 nil.class 11 >> NilClass Monday, October 15, 12

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Orientada a objetos 1 "some dummy text".class 2 >> String 3 4 1.class 5 >> Fixnum 6 7 true.class 8 >> TrueClass 9 10 nil.class 11 >> NilClass Monday, October 15, 12

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Orientada a objetos 1 "some dummy text".class 2 >> String 3 4 1.class 5 >> Fixnum 6 7 true.class 8 >> TrueClass 9 10 nil.class 11 >> NilClass Monday, October 15, 12

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Orientada a objetos 1 "some dummy text".class 2 >> String 3 4 1.class 5 >> Fixnum 6 7 true.class 8 >> TrueClass 9 10 nil.class 11 >> NilClass Monday, October 15, 12

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Orientada a objetos 1 "some dummy text".class 2 >> String 3 4 1.class 5 >> Fixnum 6 7 true.class 8 >> TrueClass 9 10 nil.class 11 >> NilClass Monday, October 15, 12

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Orientada a objetos 1 "some dummy text".class 2 >> String 3 4 1.class 5 >> Fixnum 6 7 true.class 8 >> TrueClass 9 10 nil.class 11 >> NilClass tudo é um objeto Monday, October 15, 12

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Orientada a objetos 1 "some dummy text".class 2 >> String 3 4 1.class 5 >> Fixnum 6 7 true.class 8 >> TrueClass 9 10 nil.class 11 >> NilClass sim, eu disse tudo!!! Monday, October 15, 12

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Orientada a objetos 1 "some dummy text".class 2 >> String 3 4 1.class 5 >> Fixnum 6 7 true.class 8 >> TrueClass 9 10 nil.class 11 >> NilClass 1 String.class 2 >> Class sim, eu disse tudo!!! Monday, October 15, 12

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Orientada a objetos 1 puts 1 + 1 2 >> 2 Monday, October 15, 12

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Orientada a objetos 1 puts 1 + 1 2 >> 2 3 4 puts 1.+(1) 5 >> 2 Monday, October 15, 12

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Orientada a objetos 1 [1, 2, 3, 4, 5].average Monday, October 15, 12

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Orientada a objetos 1 [1, 2, 3, 4, 5].average 2 >> NoMethodError: undefined method `average' for [1, 2, 3, 4, 5]:Array Monday, October 15, 12

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Orientada a objetos 1 [1, 2, 3, 4, 5].average 2 >> NoMethodError: undefined method `average' for [1, 2, 3, 4, 5]:Array e agora??????? Monday, October 15, 12

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Orientada a objetos 1 class Array 2 def average 3 inject(0.0) do |sum, var| 4 sum + var 5 end / self.size 6 end 7 end 8 9 [1, 2, 3, 4, 5].average 10 >> 3.0 Monday, October 15, 12

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Orientada a objetos 1 class Array 2 def average 3 inject(0.0) do |sum, var| 4 sum + var 5 end / self.size 6 end 7 end 8 9 [1, 2, 3, 4, 5].average 10 >> 3.0 open classes WINS!!!! Monday, October 15, 12

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“Se anda como um pato e fala como um pato, isso é um pato!” Monday, October 15, 12

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Desenvolvedores Ruby estão mais acostumados em deﬁnir objetos pelo que eles podem fazer, do que por seu tipo. Esta técnica é chamada de duck typing. Monday, October 15, 12

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Duck Typing 1 class Logger 2 def initialize(io) 3 @io = io 4 end 5 6 def log(message) 7 @io << "#{Time.now} - #{message}\n" 8 end 9 end Monday, October 15, 12

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Duck Typing 1 array_logger = Logger.new([]) 2 array_logger.log("Hello World") 3 4 string_logger = Logger.new("") 5 string_logger.log("Hello World") Monday, October 15, 12

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Duck Typing 1 array_logger = Logger.new([]) 2 array_logger.log("Hello World") 3 4 string_logger = Logger.new("") 5 string_logger.log("Hello World") Protocolo > Interface Monday, October 15, 12

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Instalação Monday, October 15, 12

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Instalando (Mac OS & Linux) http:/ /rvm.io Monday, October 15, 12

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Instalando (Mac OS & Linux) http:/ /rvm.io $ curl -L https:/ /get.rvm.io | bash -s stable $ source ~/.rvm/scripts/rvm $ type rvm | head -n 1 rvm is a function Monday, October 15, 12

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Instalando (Mac OS & Linux) http:/ /rvm.io $ echo '[[ -s "$HOME/.rvm/scripts/rvm" ]] && \ source "$HOME/.rvm/scripts/rvm"' > ~/.bash_proﬁle Monday, October 15, 12

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Instalando (Mac OS & Linux) http:/ /rvm.io $ rvm list known Monday, October 15, 12

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Instalando (Mac OS & Linux) http:/ /rvm.io $ rvm use ruby-1.9.3 $ rvm install ruby-1.9.3 Monday, October 15, 12

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Instalando (Mac OS & Linux) http:/ /rvm.io $ rvm list Monday, October 15, 12

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Instalando (Windows) http:/ /rubyinstaller.org/downloads Monday, October 15, 12

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“Hello World” Monday, October 15, 12

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C 1 #include 2 3 int main(void){ 4 printf("Hello World\n"); 5 return 1; 6 } Monday, October 15, 12

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Java 1 class HelloWorldApp { 2 public static void main(String[] args) { 3 System.out.println("Hello World"); 4 } 5 } Monday, October 15, 12

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Ruby 1 puts "Hello World" Monday, October 15, 12

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Rodando códigos ruby Monday, October 15, 12

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via irb IRB = Interactive RuBy Shell REPL (Read Eval Print Loop) Monday, October 15, 12

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via irb Monday, October 15, 12

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Monday, October 15, 12

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via programas Ruby $ ruby hello_world.rb Hello World Monday, October 15, 12

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Ruby Basics Monday, October 15, 12

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Comentários Monday, October 15, 12

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Comentários 1 # comentar uma linha simples 2 3 =begin 4 para um bloco de códigos 5 [1, 2, 3].each do |number| 6 puts number * 2 7 end 8 =end Monday, October 15, 12

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Variáveis Monday, October 15, 12

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Variáveis 1 age = 1 # local 2 3 @name = 'rafael' # global 4 5 @@count = 1 # class 6 7 PATH = '~/' # constant Monday, October 15, 12

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Strings Monday, October 15, 12

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Strings 1 single_quote = 'this is a string with single quote' 2 3 double_quote = "this is a string with double quote" 4 5 escaped_string = 'i\'m a escaped string' Monday, October 15, 12

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Strings (interpolação) 1 puts "20 + 20 = #{20 + 20}" 2 >> 20 + 20 = 40 Monday, October 15, 12

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Symbols Monday, October 15, 12

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Symbols 1 def walk(direction) 2 case direction 3 when 1 then move_north 4 when 2 then move_east 5 when 3 then move_south 6 when 4 then move_west 7 else "Unknown direction" 8 end Monday, October 15, 12

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Symbols 1 def walk(direction) 2 case direction 3 when :north then move_north 4 when :east then move_east 5 when :south then move_south 6 when :west then move_west 7 else "Unknown direction" 8 end Monday, October 15, 12

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Numbers Monday, October 15, 12

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Numbers 1 number = 15 2 3 number_with_delimeter = 1_000_000 4 5 float = 1.5 Monday, October 15, 12

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Numbers (conversão automática entre tipos) a = 1 a.class >> Fixnum b = 5.5 b.class >> Float Monday, October 15, 12

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Numbers (conversão automática entre tipos) a = 1 a.class >> Fixnum b = 5.5 b.class >> Float c = a + b >> 6.5 Monday, October 15, 12

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Numbers (conversão automática entre tipos) a = 1 a.class >> Fixnum b = 5.5 b.class >> Float c = a + b >> 6.5 c.class >> Float Monday, October 15, 12

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Arrays Monday, October 15, 12

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Arrays 1 items = [1, "two", :three, [4, 5, 6]] 2 3 items << 7 4 5 items[12] = 'a' 6 7 puts items[0] 8 >> 1 Monday, October 15, 12

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Arrays 1 puts items.inspect 2 >> [1, "two", :three, [4, 5, 6], 7, nil, nil, nil, nil, nil, nil, nil, "..."] Monday, October 15, 12

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Arrays 1 year_months = %w [seg ter qua qui sex sab dom ] 2 >> ["seg", "ter", "qua", "qui", "sex", "sab", “dom"] Monday, October 15, 12

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Arrays 1 year_months = %w (seg ter qua qui sex sab dom ) 2 >> ["seg", "ter", "qua", "qui", "sex", "sab", “dom"] Monday, October 15, 12

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Arrays 1 items = Array.new(5) { |i| 2 ** i } 2 >> [1, 2, 4, 8, 16] Monday, October 15, 12

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Hashes Monday, October 15, 12

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Hashes 1 market_list = {:rice => 1, "vegetables" => [ :spinach => 1, :broccoli => 2]} 2 3 market_list = {rice: 1, vegetables: [ spinach: 1, broccoli: 2 ]} 4 5 market_list[:rice] 6 7 market_list[:coca] = 2 Monday, October 15, 12

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Ranges Monday, October 15, 12

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Ranges 1 (1..10).to_a 2 >> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] 3 4 (1...10).to_a 5 >> [1, 2, 3, 4, 5, 6, 7, 8, 9] 6 7 ("a".."z").to_a 8 >> ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"] Monday, October 15, 12

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Ranges 1 string = "1a".."2g" 2 string.cover "2a" 3 >> true 4 5 string.cover "2h" 6 >> false Monday, October 15, 12

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Expressões Regulares Monday, October 15, 12

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Expressões regulares 1 regexp = /(a-z)+/ 2 3 regexp = %r((a-z)+) Monday, October 15, 12

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Expressões regulares 1 regexp = /(a-z)+/ 2 3 regexp = %r((a-z)+) Metacaracteres devem ser escapados ( ) [ ] { } . ? + * Monday, October 15, 12

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Expressões regulares Monday, October 15, 12

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Estruturas condicionais Monday, October 15, 12

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Estruturas condicionais (if/elsif/else) 1 if expression 2 # do something 3 elsif expression2 4 # do something else 5 elsif expressionN 6 # do something else 7 else 8 # do something else 9 end Monday, October 15, 12

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1 if !expression 2 # do something 3 end Estruturas condicionais (if/elsif/else) Monday, October 15, 12

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1 if !expression 2 # do something 3 end Estruturas condicionais (if/elsif/else) Monday, October 15, 12

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1 if !expression 2 # do something 3 end 4 5 unless expression 6 # do something 7 end Estruturas condicionais (if/elsif/else) Monday, October 15, 12

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Estruturas condicionais (if/elsif/else) 1 count == 1 ? 'singular' : 'plural' Monday, October 15, 12

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Estruturas condicionais (case) 1 case 2 when x == 1 then "one" 3 when x == 2 then "two" 4 when x == 3 then "three" 5 else"other" Monday, October 15, 12

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Estruturas condicionais (case) 1 case number 2 when 0..10 3 "Between 0 and 10" 4 when 11..20 5 "Between 11 and 20" 6 else 7 "You're outside my limits" 8 end Monday, October 15, 12

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Estruturas condicionais (case) 1 case text 2 when /\bruby\b/ 3 "You passed a lowercased Ruby" 4 when /\bRuby\b/ 5 "You passed a capitalized Ruby" 6 when /\bRUBY\b/ 7 "You passed an uppercased Ruby" 8 else 9 "WAT? NO RUBY?" 10 end Monday, October 15, 12

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Iteradores Monday, October 15, 12

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Iteradores Objetos das class Hash, Array e Range são iteráveis 1 1.upto(3) do |number| 2 puts number 3 end 4 5 [1, 2, 3].map { |number| number * 2 } 6 >> [2, 4, 6] 7 8 (1..10).reject { |number| number.odd? } 9 >> [2, 4, 6, 8, 10] Monday, October 15, 12

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Métodos Monday, October 15, 12

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Métodos 1 def greet(name) 2 puts "Hello #{name}" 3 end 4 5 greet "Rafael" Monday, October 15, 12

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Métodos (argumento padrão) 1 def greet(name="there") 2 puts "Hello #{name}" 3 end 4 5 greet Monday, October 15, 12

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Métodos (escopo) 1 x, y = 2, 1 2 3 def cube(x) 4 y = x**3 5 return y 6 end 7 8 puts cube(x) 9 >> 8 10 11 puts y 12 >> 1 Monday, October 15, 12

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Métodos (retorno automático) 1 x, y = 2, 1 2 3 def cube(x) 4 x**3 5 end 6 7 puts cube(x) 8 >> 8 9 10 puts y 11 >> 1 Monday, October 15, 12

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Classes Monday, October 15, 12

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Classes 1 class Person 2 end 3 4 p = Person.new Monday, October 15, 12

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Classes (métodos de instância) 1 class Person 2 def introduce 3 puts "Hello" 4 end 5 end 6 7 p = Person.new 8 p.introduce 9 >> Hello Monday, October 15, 12

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Classes (construtor) 1 class Person 2 def initialize(name) 3 @name = name # variavel de instância 4 end 5 6 def introduce 7 puts "Hello my name is #{@name}" 8 end 9 end 1 p = Person.new('rafael') 2 p.introduce 3 >> Hello my name is rafael Monday, October 15, 12

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Classes (métodos de classe) 1 class Animal 2 def self.species 3 ["alligator", "bat", ..., "bear"] 4 end 5 end 6 7 puts Animal.species Monday, October 15, 12

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Classes (getters e setters) 1 class Person 2 def name=(name) 3 @name = name 4 end 5 6 def name 7 @name 8 end 9 end 10 11 p = Person.new('rafael') 12 p.name = 'macedo' 13 puts p.name 14 >> macedo Monday, October 15, 12

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Classes (getters e setters) 1 class Person 2 attr_accessor :name 3 end 4 5 p = Person.new('rafael') 6 p.name = 'macedo' 7 puts p.name 8 >> macedo Monday, October 15, 12

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Classes (getters) 1 class Person 2 attr_reader :name 3 end 4 5 p = Person.new('rafael') 6 p.name = 'macedo' 7 NoMethodError: undefined method `name=' 8 puts p.name 8 >> macedo Monday, October 15, 12

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Classes (setters) 1 class Person 2 attr_reader :name 3 end 4 5 p = Person.new('rafael') 6 p.name = 'macedo' 7 puts p.name 8 NoMethodError: undefined method `name' Monday, October 15, 12

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Classes (inheritance) 1 class Studend < Person 2 attr_accessor :register 3 end 4 5 s = Studend.new('rafael') 6 s.register = '13286' 7 s.name = 'macedo' Monday, October 15, 12

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Classes (modules) 1 module Swimmer 2 def swim 3 puts 'I\'m swimming!' 4 end 5 end Monday, October 15, 12

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Classes (modules) 1 class Person 2 include Swimmer 3 end 4 5 Person.new.swim 6 >> I'm swimming! Monday, October 15, 12

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Quem usa? Monday, October 15, 12

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O que posso fazer? Monday, October 15, 12

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Aplicações de voz • Interactive voice response systems (IVRs) • Call Center Automation • Data Gathering • Voice 2.0 http:/ /adhearsion.com Monday, October 15, 12

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Aplicações linha de comando Monday, October 15, 12

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Games https:/ /github.com/qwertyreddy/rubystein Monday, October 15, 12

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Aplicações desktop Monday, October 15, 12

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Desktop Applications Monday, October 15, 12

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Web Applications Monday, October 15, 12

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Web Applications Monday, October 15, 12

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Web Applications Monday, October 15, 12

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Web Applications Monday, October 15, 12

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Web Applications Monday, October 15, 12

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Rails is... Ruby on Rails® is an open-source web framework that’s optimized for programmer happiness and sustainable productivity. It lets you write beautiful code by favoring convention over conﬁguration http:/ /rubyonrails.org Monday, October 15, 12

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Rails is... Ruby on Rails is intended to emphasize Convention over Conﬁguration (CoC) Monday, October 15, 12

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Rails is... Ruby on Rails is intended to emphasize Convention over Conﬁguration (CoC) Rapid development principle of Don't Repeat Yourself (DRY) Monday, October 15, 12

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Rails is... Ruby on Rails is intended to emphasize Convention over Conﬁguration (CoC) Rapid development principle of Don't Repeat Yourself (DRY) Fat models, skinny controllers Monday, October 15, 12

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$ rails new my-app -d mysql $ gem install rails Monday, October 15, 12

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