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
720
Play for (Java|Scala)
kouphax
0
120
Devops: A Case Study
kouphax
0
78
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
一人でAIプロダクトを作るための工夫 〜技術選定・開発プロセス編〜 / I want AI to work harder
rkaga
4
550
대규모 트래픽을 처리하는 프론트 개발자의 전략
maryang
0
120
令和最新版手のひらコンピュータ
koba789
12
5.5k
Constant integer division faster than compiler-generated code
herumi
2
370
Streamlitで実現できるようになったこと、実現してくれたこと
ayumu_yamaguchi
2
280
SwiftでMCPサーバーを作ろう!
giginet
PRO
2
220
管你要 trace 什麼、bpftrace 用下去就對了 — COSCUP 2025
shunghsiyu
0
250
実践!App Intents対応
yuukiw00w
1
210
Amazon Q CLI開発で学んだAIコーディングツールの使い方
licux
3
180
新しいモバイルアプリ勉強会(仮)について
uetyo
1
250
コーディングは技術者(エンジニア)の嗜みでして / Learning the System Development Mindset from Rock Lady
mackey0225
2
130
プロダクトという一杯を作る - プロダクトチームが味の責任を持つまでの煮込み奮闘記
hiliteeternal
0
410
Featured
See All Featured
Scaling GitHub
holman
461
140k
The Myth of the Modular Monolith - Day 2 Keynote - Rails World 2024
eileencodes
26
3k
Building Flexible Design Systems
yeseniaperezcruz
328
39k
Designing for Performance
lara
610
69k
JavaScript: Past, Present, and Future - NDC Porto 2020
reverentgeek
50
5.5k
Responsive Adventures: Dirty Tricks From The Dark Corners of Front-End
smashingmag
251
21k
The Language of Interfaces
destraynor
158
25k
Speed Design
sergeychernyshev
32
1.1k
Six Lessons from altMBA
skipperchong
28
3.9k
Typedesign – Prime Four
hannesfritz
42
2.7k
Design and Strategy: How to Deal with People Who Don’t "Get" Design
morganepeng
130
19k
Why You Should Never Use an ORM
jnunemaker
PRO
58
9.5k
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