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
570
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
110
React
kouphax
2
700
Play for (Java|Scala)
kouphax
0
110
Devops: A Case Study
kouphax
0
73
Scala for C# Developers
kouphax
5
2.6k
Dropwizard - Production Ready Web Services
kouphax
3
1.5k
Scala for Fun & Profit
kouphax
4
620
What Agile Means To Me
kouphax
0
130
Other Decks in Programming
See All in Programming
ts-morph実践:型を利用するcodemodのテクニック
ypresto
1
540
Spring gRPC で始める gRPC 入門 / Introduction to gRPC with Spring gRPC
mackey0225
0
140
バランスを見極めよう!実装の意味を明示するための型定義 TSKaigi 2025 Day2 (5/24)
whatasoda
2
780
バリデーションライブラリ徹底比較
nayuta999999
1
440
TypeScript を活かしてデザインシステム MCP を作る / #tskaigi_after_night
izumin5210
4
480
クラシルリワードにおける iOSアプリ開発の取り組み
funzin
1
810
Interface vs Types ~型推論が過多推論~
hirokiomote
1
230
『Python → TypeScript』オンボーディング奮闘記
takumi_tatsuno
1
140
技術的負債と戦略的に戦わざるを得ない場合のオブザーバビリティ活用術 / Leveraging Observability When Strategically Dealing with Technical Debt
yoshiyoshifujii
0
160
TSConfigからTypeScriptの世界を覗く
planck16
2
1.3k
Cloudflare Realtime と Workers でつくるサーバーレス WebRTC
nekoya3
0
240
CQRS/ESのクラスとシステムフロー ~ RailsでフルスクラッチでCQRSESを組んで みたことから得た学び~
suzukimar
0
190
Featured
See All Featured
Art, The Web, and Tiny UX
lynnandtonic
298
21k
Unsuck your backbone
ammeep
671
58k
実際に使うSQLの書き方 徹底解説 / pgcon21j-tutorial
soudai
PRO
180
53k
The Power of CSS Pseudo Elements
geoffreycrofte
76
5.8k
Designing for humans not robots
tammielis
253
25k
What's in a price? How to price your products and services
michaelherold
245
12k
Why You Should Never Use an ORM
jnunemaker
PRO
56
9.4k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
jcasabona
32
2.3k
Producing Creativity
orderedlist
PRO
346
40k
How to Create Impact in a Changing Tech Landscape [PerfNow 2023]
tammyeverts
52
2.8k
The Invisible Side of Design
smashingmag
299
50k
Bash Introduction
62gerente
614
210k
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