Reasons To Love Ruby

a bunch of reasons to love ruby

class Ben < Personis_a :mvp, :scrummaster, :aspinsider def initialize @book = “ASP.NET MVC in Action” @twitter = “subdigital” @blog= “http://flux88.com” @iphone_app= “Pocket Tabs” end ...end

def self.expert? falseend

Meet Ruby
puts“hello world”hello world
puts“hello world”.reversedlrowolleh
puts“hello world”[0..5] hello

Ruby Variables
num = 323
message = “Hey there”
stuff = [1, “foo”, true]

Ruby Loops
[“cat”, “dog”, “giraffe”].each do |s|
puts s
end
[“cat”, “dog”, “giraffe”].each { |s| puts s }

Working with Arrays
animals = [“zebra”, “donkey”, “lemur”]
animals.sort[“donkey”, “lemur”, “zebra”]
# original array is untouched
animals.sort!
# original array is modified!
animals.delete“zebra” [“donkey”, “lemur”]

Ruby has Less Ceremony
//C#
Dictionary<string, object> hash = new Dictionary<string, object>();
#ruby
hash = {}
#optional semicolons & parentheses
add(5, 6); is the same as add 5, 6

You Can Extend Existing classes
5.days.from_now

Ruby is Terse, yet Readable
3.times { print “Ho ” } => Ho Ho Ho
approve_credit unless account.deliquent?
send_email if email_enabled?

Regex is a 1st class citizen
[“red”, “blue”, “green”].grep /u/ blue
“The Times They are a-Changin’”.gsub /s/, “.”
The.Times.They.are.a-Changin’

Everything is an Object
42.class FixNum
42.2.class.superclass  Integer
42.class.superclass.superclass  Numeric
42.class.superclass.superclass.superclass  Object
No, really… everything is an object
puts customer.name unless customer.nil?
nil.classNilClass
nil.class.superclass Object

RubyGems
gem installhpricot

Speaking of hpricot…
require ‘rubygems’
require ‘hpricot’
require ‘open-uri’
uri = open(“http://whatsit.org”)
doc = Hpricot(uri)
(doc/"p/a/img").each do |img|
puts img.attributes['class']
end

Rake
task :codeGen do
# do the code generation
end
task :compile => :codeGen do
#do the compilation
end
task :dataLoad => :codeGen do
# load the test data
end
task :test => [:compile, :dataLoad] do
# run the tests
end

RSpec
# bowling_spec.rb
require 'bowling'
describe Bowling do
it "should score 0 for gutter game" do
bowling = Bowling.new
20.times { bowling.hit 0 }
bowling.score.should == 0
end
end

…and now the elephant in the room
rails

Rails is the bee’s knees because…
convention
configuration

it has
ActiveRecord

it has
Migrations

it has the
Console

scaffolding

Logging is built-in

Tests come out of the box

There is ONE WAY

What else?
heroku

What else?
IronRuby

thank_you

http://flux88.com	50
http://benscheirman.com	22
http://www.slideshare.net	3
http://rssbandit.org	1
http://translate.googleusercontent.com	1

Reasons To Love Ruby

by Ben Scheirman

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