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
420
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
520
Generative AI 年會小聚 - AI 教我寫程式
eddie
0
56
讓數據說話:用 Python、Prometheus 和 Grafana 講故事
eddie
0
510
AI 時代的程式語言學習法
eddie
0
91
前端模組解放運動 - importmap
eddie
0
1.3k
Git 和 DevOps - 在混亂的流星群開發流程中找到小確幸
eddie
1
1.1k
模組化前端開發:從亂七八糟到組織有序
eddie
0
1.5k
被 Vue 框架耽誤的建置工具
eddie
2
980
開開心心寫測試,你的程式碼也會微笑
eddie
1
1.2k
Other Decks in Programming
See All in Programming
traP の部内 ISUCON とそれを支えるポータル / PISCON Portal
ikura_hamu
0
180
PHPカンファレンス 2024|共創を加速するための若手の技術挑戦
weddingpark
0
140
QA環境で誰でも自由自在に現在時刻を操って検証できるようにした話
kalibora
1
140
ISUCON14感想戦で85万点まで頑張ってみた
ponyo877
1
590
ErdMap: Thinking about a map for Rails applications
makicamel
1
660
Fixstars高速化コンテスト2024準優勝解法
eijirou
0
190
「とりあえず動く」コードはよい、「読みやすい」コードはもっとよい / Code that 'just works' is good, but code that is 'readable' is even better.
mkmk884
6
1.4k
ecspresso, ecschedule, lambroll を PipeCDプラグインとして動かしてみた (プロトタイプ) / Running ecspresso, ecschedule, and lambroll as PipeCD Plugins (prototype)
tkikuc
2
1.9k
watsonx.ai Dojo #6 継続的なAIアプリ開発と展開
oniak3ibm
PRO
0
170
アクターシステムに頼らずEvent Sourcingする方法について
j5ik2o
6
710
週次リリースを実現するための グローバルアプリ開発
tera_ny
1
1.2k
Jaspr Dart Web Framework 박제창 @Devfest 2024
itsmedreamwalker
0
150
Featured
See All Featured
Building an army of robots
kneath
302
45k
It's Worth the Effort
3n
183
28k
The Web Performance Landscape in 2024 [PerfNow 2024]
tammyeverts
3
360
Become a Pro
speakerdeck
PRO
26
5.1k
[Rails World 2023 - Day 1 Closing Keynote] - The Magic of Rails
eileencodes
33
2k
The Power of CSS Pseudo Elements
geoffreycrofte
74
5.4k
KATA
mclloyd
29
14k
Why Our Code Smells
bkeepers
PRO
335
57k
Build The Right Thing And Hit Your Dates
maggiecrowley
33
2.5k
Build your cross-platform service in a week with App Engine
jlugia
229
18k
The Illustrated Children's Guide to Kubernetes
chrisshort
48
49k
Building Applications with DynamoDB
mza
93
6.2k
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