Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Ruby by Example
Search
James Hughes
June 22, 2012
Programming
7
580
Ruby by Example
James Hughes
June 22, 2012
Tweet
Share
More Decks by James Hughes
See All by James Hughes
Functional Programming with Clojure
kouphax
1
120
Tyrannosaurus Rx
kouphax
0
120
React
kouphax
2
710
Play for (Java|Scala)
kouphax
0
110
Devops: A Case Study
kouphax
0
77
Scala for C# Developers
kouphax
5
2.6k
Dropwizard - Production Ready Web Services
kouphax
3
1.6k
Scala for Fun & Profit
kouphax
4
630
What Agile Means To Me
kouphax
0
140
Other Decks in Programming
See All in Programming
スタートアップの急成長を支えるプラットフォームエンジニアリングと組織戦略
sutochin26
1
5.5k
VS Code Update for GitHub Copilot
74th
2
640
Flutterで備える!Accessibility Nutrition Labels完全ガイド
yuukiw00w
0
160
ニーリーにおけるプロダクトエンジニア
nealle
0
830
dbt民主化とLLMによる開発ブースト ~ AI Readyな分析サイクルを目指して ~
yoshyum
3
990
レベル1の開発生産性向上に取り組む − 日々の作業の効率化・自動化を通じた改善活動
kesoji
0
190
Hypervel - A Coroutine Framework for Laravel Artisans
albertcht
1
120
Node-RED を(HTTP で)つなげる MCP サーバーを作ってみた
highu
0
120
“いい感じ“な定量評価を求めて - Four Keysとアウトカムの間の探求 -
nealle
1
9.9k
AIともっと楽するE2Eテスト
myohei
6
2.6k
Systèmes distribués, pour le meilleur et pour le pire - BreizhCamp 2025 - Conférence
slecache
0
120
AI駆動のマルチエージェントによる業務フロー自動化の設計と実践
h_okkah
0
140
Featured
See All Featured
Dealing with People You Can't Stand - Big Design 2015
cassininazir
367
26k
Practical Orchestrator
shlominoach
189
11k
"I'm Feeling Lucky" - Building Great Search Experiences for Today's Users (#IAC19)
danielanewman
229
22k
ReactJS: Keep Simple. Everything can be a component!
pedronauck
667
120k
A better future with KSS
kneath
238
17k
The Illustrated Children's Guide to Kubernetes
chrisshort
48
50k
Refactoring Trust on Your Teams (GOTO; Chicago 2020)
rmw
34
3.1k
Bash Introduction
62gerente
613
210k
YesSQL, Process and Tooling at Scale
rocio
173
14k
Writing Fast Ruby
sferik
628
62k
XXLCSS - How to scale CSS and keep your sanity
sugarenia
248
1.3M
Performance Is Good for Brains [We Love Speed 2024]
tammyeverts
10
950
Transcript
RUBY BY EXAMPLE
Ruby is... interpreted object oriented dynamic
Ruby is... productive intuitive popular
VARIABLES & TYPES
Before we begin... a.+(b) a.is_valid? a.decrement!
$counter @@counter @counter counter Global Class Instance Local
‘hello’ ‘’‘hello’’’ %q{hello} String Herestring Perl-inspired
a = ‘James’ b = “Hello #{a}” puts b =>
“Hello James”
:hello Symbol
puts <<DOC This is a "heredoc" Multi-line String DOC
[1,2,3] {:a=>1, :b=>2} {a: 1, b: 2} 0..10 Array Hash
(1.8) Hash (1.9) Ranges
METHODS
def greet(name) “Hello, #{name}” end greet “James”
def greet(name=“World”) “Hello, #{name}” end greet “James” greet
CONTROL FLOW
if rating >= 4 puts "great" elsif rating == 3
puts "alright" else puts "sucks" end
unless rating == 5 puts “Try harder” end
puts “Try harder” unless rating == 5 puts “Seriously” if
rating == 1
case rating when 4..5 puts "great" when 3 puts "alright"
else puts "sucks" end
while !le.has_more_lines? puts !le.next_line end puts !le.next_line while !le.has_more_lines?
until !le.end_of_!le? puts !le.next_line end puts !le.next_line until !le.end_of_!le?
for i in 0...!le.line_count puts !le.lines[i] end
BLOCKS
[1,2,3,4].each do |i| puts i end
array.each(&block)
printer = Proc.new do |i| puts i end [1,2,3,4].each &printer
printer = lambda { |i| puts i }
def loggerWrapper puts "Executing Method" yield puts "Done Executing" end
loggerWrapper { puts "Weeee!" }
COLLECTIONS
Array/Enumerable Operations 109 Hash Operations 50
[1,2,3,4,5].map { |i| i +1} [1,2,3,4,5].reduce { |i, j| i
+ j } ({a: '1'}).merge({b: '2'})
CLASSES
class Person def initialize(name, age) @name,@age = name,age end end
person = Person.new("James", 32)
class Person attr_accessor :name attr_accessor :age ... end p =
Person.new("James", 32) puts p.name, p.age
class Person ... end class Hero < Person attr_accessor :powers
end p = Hero.new("James", 32) p.powers = [“Flying”]
MODULES & MIXINS
module StrUtils def self.salt(pass, slt) “#{pass}#{salt}” end def salt(slt) StrUtils::salt(@value,
slt) end end
StrUtils::salt("123", "456")
class Password include Utils def initialize(value) @value = value end
end Password.new("test").salt
TOOLS OF THE TRADE
irb Interactive shell ruby Ruby interpreter gem Library manager rake
Build tool rails Web framework
RUBY BY EXAMPLE