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 Stdlib – Minsk.rb October 2012
Search
Sergey Nartimov
October 27, 2012
Programming
10
360
Ruby Stdlib – Minsk.rb October 2012
Sergey Nartimov
October 27, 2012
Tweet
Share
More Decks by Sergey Nartimov
See All by Sergey Nartimov
PubSub at Rails
lest
0
120
Rails in production - RubyConfBY 22 Mar 2015
lest
1
150
Sequel - BRUG 21 Feb 2015
lest
0
81
Elixir – Belarus Ruby User Group 25 Jan 2014
lest
3
660
Authentication Security – RUBYSPB
lest
2
170
Geospatial applications on Rails
lest
8
410
Design patterns – Belarus Ruby on Rails User Group 23 Feb 2013
lest
8
650
Background jobs with realtime results – RailsClub'Moscow 2012
lest
5
210
Other Decks in Programming
See All in Programming
関数型まつり2025登壇資料「関数プログラミングと再帰」
taisontsukada
2
850
明示と暗黙 ー PHPとGoの インターフェイスの違いを知る
shimabox
2
320
データの民主化を支える、透明性のあるデータ利活用への挑戦 2025-06-25 Database Engineering Meetup#7
y_ken
0
320
Benchmark
sysong
0
270
DroidKnights 2025 - 다양한 스크롤 뷰에서의 영상 재생
gaeun5744
3
320
NPOでのDevinの活用
codeforeveryone
0
330
KotlinConf 2025 現地で感じたServer-Side Kotlin
n_takehata
1
230
ReadMoreTextView
fornewid
1
480
#kanrk08 / 公開版 PicoRubyとマイコンでの自作トレーニング計測装置を用いたワークアウトの理想と現実
bash0c7
1
460
エンジニア向け採用ピッチ資料
inusan
0
160
既存デザインを変更せずにタップ領域を広げる方法
tahia910
1
240
技術同人誌をMCP Serverにしてみた
74th
1
370
Featured
See All Featured
Product Roadmaps are Hard
iamctodd
PRO
54
11k
Fight the Zombie Pattern Library - RWD Summit 2016
marcelosomers
233
17k
Measuring & Analyzing Core Web Vitals
bluesmoon
7
490
Fashionably flexible responsive web design (full day workshop)
malarkey
407
66k
Put a Button on it: Removing Barriers to Going Fast.
kastner
60
3.9k
Cheating the UX When There Is Nothing More to Optimize - PixelPioneers
stephaniewalter
281
13k
The Cult of Friendly URLs
andyhume
79
6.5k
A Tale of Four Properties
chriscoyier
160
23k
CoffeeScript is Beautiful & I Never Want to Write Plain JavaScript Again
sstephenson
161
15k
Typedesign – Prime Four
hannesfritz
42
2.7k
Principles of Awesome APIs and How to Build Them.
keavy
126
17k
The Power of CSS Pseudo Elements
geoffreycrofte
77
5.8k
Transcript
Ruby Stdlib Sergey Nartimov Brainspec https://github.com/lest twitter: @just_lest
About me • Rails, Rubinius, Elixir contributor • Software engineer
at Brainspec • Consulting, training, development Sergey Nartimov Brainspec https://github.com/lest twitter: @just_lest
Struct
Struct class Point < Struct.new(:x, :y) end
Struct class Point < Struct.new(:x, :y) end point = Point.new(4,
2)
Struct class Point < Struct.new(:x, :y) end point = Point.new(4,
2) point.x # => 4 point.y # => 2
Struct class Point < Struct.new(:x, :y) end point = Point.new(4,
2) point.x # => 4 point.y # => 2 point.z # NoMethodError
OStruct
OStruct require 'ostruct'
OStruct require 'ostruct' point = OStruct.new(x: 4, y: 2)
OStruct require 'ostruct' point = OStruct.new(x: 4, y: 2) point.x
# => 4 point.y # => 2
OStruct require 'ostruct' point = OStruct.new(x: 4, y: 2) point.x
# => 4 point.y # => 2 point.z # => nil
OStruct require 'ostruct' point = OStruct.new(x: 4, y: 2) point.x
# => 4 point.y # => 2 point.z # => nil point.z = 0
Set
Set input = [1, -2, 2, 3]
Set input = [1, -2, 2, 3] results = []
input.each do |value| results << value.abs end
Set input = [1, -2, 2, 3] results = []
input.each do |value| results << value.abs end results # => [1, 2, 2, 3]
Set input = [1, -2, 2, 3] results = []
input.each do |value| results << value.abs end results.uniq # => [1, 2, 3]
Set input = [1, -2, 2, 3] results = []
input.each do |value| results << value.abs unless ... end results # => [1, 2, 3]
Set require 'set'
Set require 'set' input = [1, -2, 2, 3]
Set require 'set' input = [1, -2, 2, 3] results
= Set.new input.each do |value| results << value.abs end
Set require 'set' input = [1, -2, 2, 3] results
= Set.new input.each do |value| results << value.abs end results # => #<Set: {1, 2, 3}>
SortedSet require 'set' set = SortedSet.new set << 1 set
<< 3 set << 2
SortedSet require 'set' set = SortedSet.new set << 1 set
<< 3 set << 2 output = [] set.each do |value| output << value end output # => [1, 2, 3]
Shellwords
Shellwords pattern = 'belongs_to :user'
Shellwords pattern = 'belongs_to :user' escaped = Shellwords.escape(pattern) system("grep -r
#{escaped} app/models")
Shellwords pattern = 'belongs_to :user' escaped = Shellwords.escape(pattern) system("grep -r
#{escaped} app/models") escaped = pattern.shellescape system("grep -r #{escaped} app/models")
Shellwords argv = ['grep', '-r', 'belongs_to :user', 'app/models']
Shellwords argv = ['grep', '-r', 'belongs_to :user', 'app/models'] system(argv.map(&:shellescape).join(' '))
Shellwords argv = ['grep', '-r', 'belongs_to :user', 'app/models'] system(argv.map(&:shellescape).join(' '))
Shellwords argv = ['grep', '-r', 'belongs_to :user', 'app/models'] system(argv.map(&:shellescape).join(' '))
system(Shellwords.join(argv))
Shellwords argv = ['grep', '-r', 'belongs_to :user', 'app/models'] system(argv.map(&:shellescape).join(' '))
system(Shellwords.join(argv)) system(argv.shelljoin)
Shellwords cmd = 'grep -r "belongs_to :user" app/ models'
Shellwords cmd = 'grep -r "belongs_to :user" app/ models' Shellwords.split(cmd)
# => ["grep", "-r", "belongs_to :user", "app/models"]
Shellwords cmd = 'grep -r "belongs_to :user" app/ models' Shellwords.split(cmd)
# => ["grep", "-r", "belongs_to :user", "app/models"] cmd.shellsplit # => ["grep", "-r", "belongs_to :user", "app/models"]
SecureRandom
SecureRandom require 'securerandom'
SecureRandom require 'securerandom' SecureRandom.base64 # => "7lM0q9QF8oYvq20WSGOmOw=="
SecureRandom require 'securerandom' SecureRandom.base64 # => "7lM0q9QF8oYvq20WSGOmOw==" SecureRandom.hex # =>
"c0cff5ead6260fe58ebd4ddab83a3497"
SecureRandom require 'securerandom' SecureRandom.base64 # => "7lM0q9QF8oYvq20WSGOmOw==" SecureRandom.hex # =>
"c0cff5ead6260fe58ebd4ddab83a3497" SecureRandom.uuid # => "4b6ff327-cb9f-43e2-a067-342072b144bd"
Delegator
Delegator class Person < Struct.new(:name) end person = Person.new('John')
Delegator class Person < Struct.new(:name) end person = Person.new('John') redditor
= Reddittor.new(person)
Delegator class Person < Struct.new(:name) end person = Person.new('John') redditor
= Reddittor.new(person) redditor.name # => 'John'
Delegator class Person < Struct.new(:name) end person = Person.new('John') redditor
= Reddittor.new(person) redditor.name # => 'John' redditor.submit_link # => 'Link by John'
Delegator require 'delegate'
Delegator class Redditor < Delegator def initialize(person) end end
Delegator class Redditor < Delegator def initialize(person) end def __setobj__(person)
@person = person end def __getobj__ @person end end
Delegator class Redditor < Delegator def initialize(person) __setobj__(person) end def
__setobj__(person) @person = person end def __getobj__ @person end end
Delegator class Redditor < Delegator def initialize(person) __setobj__(person) end def
__setobj__(person) @person = person end def __getobj__ @person end def submit_link "Link by #{name}" end end
Delegator person = Person.new('John') redditor = Redditor.new(person) redditor.name # =>
'John' redditor.submit_link # => 'Link by John'
tl;dr
Delegator class Redditor < SimpleDelegator def initialize(person) super(person) end def
submit_link "Link by #{name}" end end
Delegator person = Person.new('John') redditor = Redditor.new(person) redditor.name # =>
'John'
Delegator person = Person.new('John') redditor = Redditor.new(person) redditor.name # =>
'John' redditor.methods.grep(/name/) # => [:name, :name=]
Delegator person = Person.new('John') redditor = Redditor.new(person) redditor.name # =>
'John' redditor.methods.grep(/name/) # => [:name, :name=] Redditor.instance_methods.grep(/name/) # => []
Delegator class Redditor < DelegateClass(Person) def initialize(person) super(person) end def
submit_link "Link by #{name}" end end
Delegator class Redditor < DelegateClass(Person) def initialize(person) super(person) end def
submit_link "Link by #{name}" end end Redditor.instance_methods.grep(/name/) # => [:name, :name=]
Thanks! Sergey Nartimov Brainspec https://github.com/lest twitter: @just_lest