TechTalk #67 : Introduction to Ruby and Sinatra

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

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

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

Ruby is Versatile
Scripting
Server side web (Rails, Sinatra, etc.)
Client side web (Opal, Volt)
Mobile (Ruby Motion)
Robotics (Artoo)
JVM based app (JRuby)

Ruby.new
def greeting(name);
result = "Hello, " + name;
return result;
end;
puts(greeting("Delta"));
puts(greeting("Puti"));

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

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

Monkey Patch Everything
class String
def shout!
"#{self.upcase}!!!"
end
end
puts "Tech Talk JDV".shout!

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}"

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}"

Hashes
person = {
'name' => 'Delta Purna Widyangga',
'age' => '28',
'job' => 'Programmer'
}
p person['name']
p person['job']
p person['weight']

Blocks (1)
def my_block
puts "Begin"
yield
yield
puts "End"
end
my_block { puts "Inside my block" }

Blocks (2)
def our_programmers
yield "Hiraq", "Backend"
yield "Fikri", "Frontend"
end
our_programmers do |name, role|
puts "#{name} is a #{role} developer"
end

Iterators
[ 'angga', 'oki', 'omayib' ].each {|name| print name, " " }
3.times { print "*" }
2.upto(8) {|i| print i }
('b'..'f').each {|char| print char }
puts

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 }

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'

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)

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

Installing Sinatra
Sinatra adalah sebuah gem (library di ruby)
gem install sinatra
https://rubygems.org/gems/sinatra

Hello Sinatra
require 'sinatra'
get '/' do
'Hello Sinatra!'
end

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

TechTalk #67 : Introduction to Ruby and Sinatra

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