Gigigo Ruby Workshop
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The document provides an overview of Ruby concepts including operations, strings, arrays, hashes, variables, methods, classes, error handling, and how to deploy a Sinatra app to Heroku using Unicorn. It demonstrates basic syntax for arithmetic operations, string manipulation, defining and calling methods, creating and accessing objects, and rescuing errors. The last section describes configuring a Sinatra app to run on Unicorn and deploying to Heroku.
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![Basics
my_array = ['Element1', 'Element2', 'Element3']
my_dict = {name: 'Alex', surname: 'Rupérez'}
puts "my_array contains #{my_array.count} elements"
puts "my_array is empty" if my_array.empty?
puts "My name is #{my_dict[:name]}" unless
!my_dict[:name]
first_element = my_array.empty? ? 'Unknown' :
my_array.first
my_dict[:surname] ||= "Smith"](https://image.slidesharecdn.com/rubyworkshop-141111024430-conversion-gate01/85/Gigigo-Ruby-Workshop-4-320.jpg)
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Gigigo Ruby Workshop
- 2. Operations 2 + 6 3 * 4 4 - 9 10 / 5 5 % 2
- 3. Strings "String with whites" 'String' :symbol "String with whites".reverse "String with whites".length 'Composite' + ' ' + 'String' 'String' * 5
- 4. Basics my_array = ['Element1', 'Element2', 'Element3'] my_dict = {name: 'Alex', surname: 'Rupérez'} puts "my_array contains #{my_array.count} elements" puts "my_array is empty" if my_array.empty? puts "My name is #{my_dict[:name]}" unless !my_dict[:name] first_element = my_array.empty? ? 'Unknown' : my_array.first my_dict[:surname] ||= "Smith"
- 5. Variables local $global @instance @@class
- 6. Methods def sum(param1, param2) param1 + param2 end def my_method param if param return param else return nil end end
- 7. Classes class MyClass def initialize(prop1, prop2) @prop1 = prop1 @prop2 = prop2 end def sum @prop1 + @prop2 end end obj = MyClass.new(5, 15) puts obj.sum
- 8. Error Handling begin puts 1/0 rescue => my_error puts my_error end value = 1/0 rescue nil
- 9. Sinatra + Unicorn + Heroku
- 10. Gemfile source 'https://rubygems.org' gem 'unicorn' gem 'sinatra'
- 11. web.rb require 'sinatra' set :bind, '0.0.0.0' get '/' do "Hello world!" end
- 12. config.ru require './web' run Sinatra::Application
- 13. unicorn.rb worker_processe s 3 timeout 15 preload_app true
- 14. Procfile web: bundle exec unicorn -p $PORT -c ./unicorn.rb