Introduction to Ruby and Sinatra

This decks is presented on a Tech Talk (bincangteknologi.com) at Jogja Digital Valley on 25th March 2015.

It covers topics of ruby basics as well as short introduction to the ruby micro framework Sinatra.

The accompanying code can be found in https://github.com/deltapurna/intro_to_ruby_and_sinatra

Transcript

1. Ruby dan Sinatra By: Delta Purna Widyangga | @deltawidyangga d@qiscus.com
2. Tentang Ruby A dynamic, open source programming language with a focus on simplicity and productivity. It has elegant syntax that is natural to read and easy to write - ruby-lang.org Dibuat oleh @matz (Yukihiro Matsumoto) Public release 1995 Object Oriented Sekarang versi 2.2.1 https://github.com/ruby/ruby
3. Why Ruby "Ruby stays out of your way" (Dave Thomas) “trying to make Ruby natural, not simple” (Matz) Imperative with functional flavor (+OO) Versatile Great communities ( ) RubyGems
4. Ruby is Versatile Scripting Server side web (Rails, Sinatra, etc.) Client side web (Opal, Volt) Mobile (Ruby Motion) Robotics (Artoo) JVM based app (JRuby)
5. Ruby.new def greeting(name); result = "Hello, " + name; return result; end; puts(greeting("Delta")); puts(greeting("Puti"));
6. Ruby.new (Refined) def greeting(name) "Hello, #{name}" end puts greeting("Delta") puts greeting("Puti") No semicolon | return the last expression | optional parentheses | String interpolation
7. Object.. Object.. Everywhere puts "Tech Talk JDV".length puts "Qiscus".index("c") puts "Delta Purna".reverse puts 42.even? puts nil.to_i String, FixNum, Everything on ruby land, even nothing is an object
8. Monkey Patch Everything class String def shout! "#{self.upcase}!!!" end end puts "Tech Talk JDV".shout!
9. Can doesn't mean you should class Animal; def walk; "Walking..."; end; end; class Cat < Animal def speak "Meong..." end end puts "#{Cat.new.speak} while #{Cat.new.walk}"
10. Arrays my_arr = [ 10, 'qiscus', 1.618 ] puts "The second element is #{my_arr[1]}" # set the third element my_arr[2] = nil puts "The array is now #{my_arr}"
11. Hashes person = { 'name' => 'Delta Purna Widyangga', 'age' => '28', 'job' => 'Programmer' } p person['name'] p person['job'] p person['weight']
12. Blocks (1) def my_block puts "Begin" yield yield puts "End" end my_block { puts "Inside my block" }
13. Blocks (2) def our_programmers yield "Hiraq", "Backend" yield "Fikri", "Frontend" end our_programmers do |name, role| puts "#{name} is a #{role} developer" end
14. Iterators [ 'angga', 'oki', 'omayib' ].each {|name| print name, " " } 3.times { print "*" } 2.upto(8) {|i| print i } ('b'..'f').each {|char| print char } puts
15. Collections p [ 1, 2, 3 ].map { |n| n * 2 } p (1..10).select { |n| n % 2 == 0 } p [ 10, 20, 30 ].reduce { |sum, n| sum + n }
16. Ruby for DSL Ruby is good for creating internal Domain Specific Language (DSL) tweet_as('deltawidyangga') do text 'hello world this is my first tweet' mention 'putiayusetiani' link 'http://melangkahkesurga.com' hashtag 'first' end tweet_as('deltawidyangga') do mention 'putiayusetiani'
17. Tentang Sinatra Sinatra is a DSL for quickly creating web applications in Ruby with minimal effort - sinatrarb.com Dibuat oleh @bmizerany (Blake Mizerany) tahun 2007 Sekarang di maintain oleh @rkh (Konstantin Haase)
18. Why Sinatra They are both solving a different set of issues, even though they indeed overlap. While Rails is a framework focused on writing model driven web applications, Sinatra is a library for dealing with HTTP from the server side. If you think in terms of HTTP requests/responses, Sinatra is the ideal tool. If you need full integration and as much boilerplate as possible, Rails is the way to go. - Konstantin Sinatra is great for the micro-style, Rails is not. As long as you stay micro, Sinatra will beat Rails. If you go beyond micro, Rails will beat Sinatra. - David
19. Installing Sinatra Sinatra adalah sebuah gem (library di ruby) gem install sinatra https://rubygems.org/gems/sinatra
20. Hello Sinatra require 'sinatra' get '/' do 'Hello Sinatra!' end
21. Resources Komunitas Untuk Belajar jogja.rb id-tech id-ruby Belajar Ruby on Rails @qiscus RoR Semarang Try Ruby Belajar Ruby Bahasa Indonesia Codecademy Ruby Learn Ruby the Hard Way The Pickaxe Book Sinatra README Sinatra Book