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Brief Ruby/Ruby on Rails intro
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Florian Plank
March 28, 2014
Programming
3
150
Brief Ruby/Ruby on Rails intro
Florian Plank
March 28, 2014
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Transcript
RUBY A PROGRAMMER’S BEST FRIEND
Background
Yukihiro “Matz” Matsumoto
I hope to see Ruby help every programmer in the
world to be productive, and to enjoy programming, and to be happy. at is the primary purpose of Ruby language.” “
- Programmer happiness - Principle of least astonishment - Human
readable - Beautiful syntax Principles
- RubyGems, Bundler & Rake - Multiple implementations (MRI, JRuby,
Rubinius, mruby, MacRuby, Topaz, …) - Solid Standard Library Ecosystem
- MINASWAN - Self re ective - Open - Quirky
Community
The Language A Sales Pitch
None
Object–oriented 1
5.times { print "We love Ruby" }
class Animal def eat(food) puts "Animal eating" end end my_animal
= Animal.new animal.eat # => "Animal eating"
class Dog < Animal def eat(food) puts "Dog eating" super
end end
module Stomach def digest(food) # ... end end
class Dog < Animal include Stomach end my_dog = Dog.new
dog.digest
-199.abs # => 199 "Foobar".split("").uniq.sort.join # => "abFor" nil.class #
=> "NilClass"
Dynamically typed Duck–typing 2
if dog.is_a? Animal dog.eat end dog.eat if dog.respond_to?(:eat)
Monkey–patching (Duck–punching) 3
… if it walks like a duck and talks like
a duck, it’s a duck, right? So if this duck is not giving you the noise that you want, you’ve got to just punch that duck until it returns what you expect.” “
class String def yell "#{self.upcase}!" end end "hello".yell # =>
"HELLO!"
Meta–programming 4
class Greeter def method_missing(name, *args) name = name.to_s if name
=~ /^hello_/ puts "Hello, #{name.gsub(/^hello_/, '')}!" else super end end end Greeter.new.hello_john # => "Hello, john!"
Blocks & Lambdas 5
[1, 2, 3].map { |i| i ** 2 } #
=> [1, 4, 9]
def greet(&block) # ... greeting = yield("John") # ... end
greet do |name| "Hello, #{name}!" end
A word on speed
Ruby on Rails An (even shorter) sales pitch
None
- Open Source Web Framework - MVC - Convention over
Con guration - DRY - Opinionated Principles
- Generators - ORM - Restful routing - Included webserver
Features
$ gem install rails $ rails new blog $ cd
blog $ rails generate scaffold post title content:text $ rake db:migrate $ rails server
author = Author.find_by :name => "John" author.posts.first.title
Book.where(:title => 'Tale of Two Cities') .first_or_create
class Account < ActiveRecord::Base # Returns all accounts with unread
messages. def self.with_unread_messages joins(:messages).merge(Message.unread) end end
None