Ruby adalah bahasa pemograman yang dinamis, open-source dengan fokus di simplicity dan productivity. Ruby memiliki syntax yang elegan yang natural dan mudah untuk dibaca dan ditulis. dirilis sejak tahun 1995 ruby sekarang banyak digunakan di berbagai aplikasi, baik scripting, web, bahkan mobile development. Techtalk kali ini akan membahas beberapa basic pemrograman ruby, khususnya hal-hal yang mungkin jarang ditemukan di bahasa pemograman lainnya. Kemudian kita akan membahas aplikasi ruby di pemrograman web dengan memperkenalkan Sinatra, sebuah micro web framework yang elegan dan menginspirasi banyak micro web framework di bahasa pemrograman lainnya.

1. Ruby dan Sinatra
By: Delta Purna Widyangga
| @deltawidyanggad@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