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 for Starter
Search
高見龍
March 23, 2013
Programming
3
440
Ruby for Starter
高見龍
March 23, 2013
Tweet
Share
More Decks by 高見龍
See All by 高見龍
為你自己學 Python
eddie
0
620
Generative AI 年會小聚 - AI 教我寫程式
eddie
0
100
讓數據說話:用 Python、Prometheus 和 Grafana 講故事
eddie
0
630
AI 時代的程式語言學習法
eddie
0
140
前端模組解放運動 - importmap
eddie
0
1.4k
Git 和 DevOps - 在混亂的流星群開發流程中找到小確幸
eddie
1
1.2k
模組化前端開發:從亂七八糟到組織有序
eddie
0
1.6k
被 Vue 框架耽誤的建置工具
eddie
2
1k
開開心心寫測試,你的程式碼也會微笑
eddie
1
1.3k
Other Decks in Programming
See All in Programming
TypeScriptでDXを上げろ! Hono編
yusukebe
3
860
PHPUnitの限界をPlaywrightで補完するテストアプローチ
yuzneri
0
270
チームのテスト力を総合的に鍛えて品質、スピード、レジリエンスを共立させる/Testing approach that improves quality, speed, and resilience
goyoki
5
1.2k
テスターからテストエンジニアへ ~新米テストエンジニアが歩んだ9ヶ月振り返り~
non0113
2
240
Claude Code + Container Use と Cursor で作る ローカル並列開発環境のススメ / ccc local dev
kaelaela
12
7.4k
React は次の10年を生き残れるか:3つのトレンドから考える
oukayuka
40
14k
「App Intent」よくわからんけどすごい!
rinngo0302
1
120
抽象化という思考のツール - 理解と活用 - / Abstraction-as-a-Tool-for-Thinking
shin1x1
1
530
No Install CMS戦略 〜 5年先を見据えたフロントエンド開発を考える / no_install_cms
rdlabo
0
160
リバースエンジニアリング新時代へ! GhidraとClaude DesktopをMCPで繋ぐ/findy202507
tkmru
4
1.2k
Gemini CLIの"強み"を知る! Gemini CLIとClaude Codeを比較してみた!
kotahisafuru
2
150
効率的な開発手段として VRTを活用する
ishkawa
1
180
Featured
See All Featured
YesSQL, Process and Tooling at Scale
rocio
173
14k
Build your cross-platform service in a week with App Engine
jlugia
231
18k
Templates, Plugins, & Blocks: Oh My! Creating the theme that thinks of everything
marktimemedia
31
2.4k
Producing Creativity
orderedlist
PRO
346
40k
Performance Is Good for Brains [We Love Speed 2024]
tammyeverts
10
990
The Power of CSS Pseudo Elements
geoffreycrofte
77
5.9k
Six Lessons from altMBA
skipperchong
28
3.9k
Design and Strategy: How to Deal with People Who Don’t "Get" Design
morganepeng
130
19k
Building a Scalable Design System with Sketch
lauravandoore
462
33k
Connecting the Dots Between Site Speed, User Experience & Your Business [WebExpo 2025]
tammyeverts
8
370
How To Stay Up To Date on Web Technology
chriscoyier
790
250k
Mobile First: as difficult as doing things right
swwweet
223
9.7k
Transcript
Ruby Starter eddie@fju
None
current status
80% iOS app, 20% Ruby/Rails
What I want?
Problem Solving
History
まつもと ゆきひろ (Matz)
first released at 1995
2.0 released at 2013
None
Why Ruby? free, open source, easy to learn
Ruby != Rails
Happy, and Fun
Rubies CRuby(MRI), REE, mRuby, JRuby, IronRuby, Rubinius..etc
Version 1.8, 1.9, 2.0
Ruby 1.8 has no future
RVM Ruby Version Manager https://rvm.io/
Editors Vim, Emacs, TextMate, Sublime Text... etc
git
coding style https://github.com/styleguide/ruby
Variables and Constants
local variable variable
global variable $variable
instance variable @variable
class variable @@variable
virtual variable true, false, self, nil
variable assignment a = 1 x, y, z = 1,
2, 3
Constant begins with a capital letter, and it can be
changed
Reserved word and Keyword
Logic and Flow Control
only false and nil are false
true v.s. TrueClass false v.s. FalseClass nil v.s. NilClass
if..elsif..end
unless = if not
if modifier
case .. when..
BEGIN{} and END{}
a = true ? 'a' : 'b'
a ||= 'a'
Comment # single line
Comment =begin .. =end
Loop and Iteration
for.. in..
while .. end
until .. end
until = while not
times
upto, downto
each, each_with_index
Block
Proc
my_square = Proc.new { | x | x ** 2
} my_square.call(10) # 100 my_square[10] # 100
lambda, ->
my_lambda = lambda { | x | x ** 2
} # new style in 1.9 my_lambda = -> x { x ** 2 } # how to call a lambda? my_lambda.call(10) my_lambda[10]
Proc v.s. lambda
def proc_test puts "hello" my_proc = Proc.new { return 1
} my_proc.call puts "ruby" end def lambda_test puts "hello" my_lambda = lambda { return 1 } my_lambda.call puts "ruby" end
{} v.s. do..end http://blog.eddie.com.tw/2011/06/03/do-end-vs-braces/
Number
Fixnum and Bignum
10 / 3
String http://ruby-doc.org/core-1.9.2/String.html
single and double quotes
%q v.s. %Q
"%s" % "eddie"
string interpolation
Array http://ruby-doc.org/core-1.9.2/Array.html
Array.new v.s. []
%w
Hash http://ruby-doc.org/core-1.9.2/Hash.html
Hash.new v.s {}
a = { :name => 'eddie' } a = {
name: 'eddie' }
Range http://ruby-doc.org/core-1.9.2/Range.html
(1..10) v.s. (1...10)
Methods
def method_name(param) ... end
parentheses can be omitted
? and !
return value
Singleton Method
class Cat def walk puts "I'm walking" end end cat
= Cat.new def cat.fly puts "I can fly" end cat.fly
Method Missing
def method_missing(method_name) puts "method: #{method_name} is called!" end [1, 2,
3, 4].hello
Exception Handling begin .. rescue.. else.. ensure.. end
def open_my_file(file_name) File.open file_name do |f| puts f.read end end
begin open_my_file("block_demo.r") rescue => e puts e else puts "it's working good!" ensure puts "this must be executed, no matter what" end
Object-Oriented Programming
everything in Ruby is an Object
object = state+ behavior
top class = Object top class would be BasicObject in
Ruby 1.9
class ClassName < ParentClass ... end
Naming Convention
initialize
ClassName.new
self = current object
instance and class variable
instance and class method
public, protected and private method
getter and setter
attr_reader, attr_writer and attr_accessor
Open Class
Module
module ModuleName ... end
module has no inheritance
module has no instance
Naming Convention
require v.s. load
Mixin
Ruby is single inheritance
Duck Typing
include v.s. extend
Gem
gem install PACKAGE_NAME
gem env
Bundle
Gemfile
gem "nokogiri", :git => "git://github.com/tenderlove/nokogiri.git" gem "secret_gem", :path => "~/my_secret_path"
bundle install
pack your own gem!
1. bundle gem NEW_NAME 2. gem build NEW_NAME.gemspec 3. gem
push NEW_NAME.gem http://docs.rubygems.org/read/chapter/20
Rake
Ruby Object Model