Ruby Stdlib – Minsk.rb October 2012

Slide 1

Slide 1 text

Ruby Stdlib Sergey Nartimov Brainspec https://github.com/lest twitter: @just_lest

Slide 2

Slide 2 text

About me • Rails, Rubinius, Elixir contributor • Software engineer at Brainspec • Consulting, training, development Sergey Nartimov Brainspec https://github.com/lest twitter: @just_lest

Slide 3

Slide 3 text

Struct

Slide 4

Slide 4 text

Struct class Point < Struct.new(:x, :y) end

Slide 5

Slide 5 text

Struct class Point < Struct.new(:x, :y) end point = Point.new(4, 2)

Slide 6

Slide 6 text

Struct class Point < Struct.new(:x, :y) end point = Point.new(4, 2) point.x # => 4 point.y # => 2

Slide 7

Slide 7 text

Struct class Point < Struct.new(:x, :y) end point = Point.new(4, 2) point.x # => 4 point.y # => 2 point.z # NoMethodError

Slide 8

Slide 8 text

OStruct

Slide 9

Slide 9 text

OStruct require 'ostruct'

Slide 10

Slide 10 text

OStruct require 'ostruct' point = OStruct.new(x: 4, y: 2)

Slide 11

Slide 11 text

OStruct require 'ostruct' point = OStruct.new(x: 4, y: 2) point.x # => 4 point.y # => 2

Slide 12

Slide 12 text

OStruct require 'ostruct' point = OStruct.new(x: 4, y: 2) point.x # => 4 point.y # => 2 point.z # => nil

Slide 13

Slide 13 text

OStruct require 'ostruct' point = OStruct.new(x: 4, y: 2) point.x # => 4 point.y # => 2 point.z # => nil point.z = 0

Slide 14

Slide 14 text

Set

Slide 15

Slide 15 text

Set input = [1, -2, 2, 3]

Slide 16

Slide 16 text

Set input = [1, -2, 2, 3] results = [] input.each do |value| results << value.abs end

Slide 17

Slide 17 text

Set input = [1, -2, 2, 3] results = [] input.each do |value| results << value.abs end results # => [1, 2, 2, 3]

Slide 18

Slide 18 text

Set input = [1, -2, 2, 3] results = [] input.each do |value| results << value.abs end results.uniq # => [1, 2, 3]

Slide 19

Slide 19 text

Set input = [1, -2, 2, 3] results = [] input.each do |value| results << value.abs unless ... end results # => [1, 2, 3]

Slide 20

Slide 20 text

Set require 'set'

Slide 21

Slide 21 text

Set require 'set' input = [1, -2, 2, 3]

Slide 22

Slide 22 text

Set require 'set' input = [1, -2, 2, 3] results = Set.new input.each do |value| results << value.abs end

Slide 23

Slide 23 text

Set require 'set' input = [1, -2, 2, 3] results = Set.new input.each do |value| results << value.abs end results # => #

Slide 24

Slide 24 text

SortedSet require 'set' set = SortedSet.new set << 1 set << 3 set << 2

Slide 25

Slide 25 text

SortedSet require 'set' set = SortedSet.new set << 1 set << 3 set << 2 output = [] set.each do |value| output << value end output # => [1, 2, 3]

Slide 26

Slide 26 text

Shellwords

Slide 27

Slide 27 text

Shellwords pattern = 'belongs_to :user'

Slide 28

Slide 28 text

Shellwords pattern = 'belongs_to :user' escaped = Shellwords.escape(pattern) system("grep -r #{escaped} app/models")

Slide 29

Slide 29 text

Shellwords pattern = 'belongs_to :user' escaped = Shellwords.escape(pattern) system("grep -r #{escaped} app/models") escaped = pattern.shellescape system("grep -r #{escaped} app/models")

Slide 30

Slide 30 text

Shellwords argv = ['grep', '-r', 'belongs_to :user', 'app/models']

Slide 31

Slide 31 text

Shellwords argv = ['grep', '-r', 'belongs_to :user', 'app/models'] system(argv.map(&:shellescape).join(' '))

Slide 32

Slide 32 text

Shellwords argv = ['grep', '-r', 'belongs_to :user', 'app/models'] system(argv.map(&:shellescape).join(' '))

Slide 33

Slide 33 text

Shellwords argv = ['grep', '-r', 'belongs_to :user', 'app/models'] system(argv.map(&:shellescape).join(' ')) system(Shellwords.join(argv))

Slide 34

Slide 34 text

Shellwords argv = ['grep', '-r', 'belongs_to :user', 'app/models'] system(argv.map(&:shellescape).join(' ')) system(Shellwords.join(argv)) system(argv.shelljoin)

Slide 35

Slide 35 text

Shellwords cmd = 'grep -r "belongs_to :user" app/ models'

Slide 36

Slide 36 text

Shellwords cmd = 'grep -r "belongs_to :user" app/ models' Shellwords.split(cmd) # => ["grep", "-r", "belongs_to :user", "app/models"]

Slide 37

Slide 37 text

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"]

Slide 38

Slide 38 text

SecureRandom

Slide 39

Slide 39 text

SecureRandom require 'securerandom'

Slide 40

Slide 40 text

SecureRandom require 'securerandom' SecureRandom.base64 # => "7lM0q9QF8oYvq20WSGOmOw=="

Slide 41

Slide 41 text

SecureRandom require 'securerandom' SecureRandom.base64 # => "7lM0q9QF8oYvq20WSGOmOw==" SecureRandom.hex # => "c0cff5ead6260fe58ebd4ddab83a3497"

Slide 42

Slide 42 text

SecureRandom require 'securerandom' SecureRandom.base64 # => "7lM0q9QF8oYvq20WSGOmOw==" SecureRandom.hex # => "c0cff5ead6260fe58ebd4ddab83a3497" SecureRandom.uuid # => "4b6ff327-cb9f-43e2-a067-342072b144bd"

Slide 43

Slide 43 text

Delegator

Slide 44

Slide 44 text

Delegator class Person < Struct.new(:name) end person = Person.new('John')

Slide 45

Slide 45 text

Delegator class Person < Struct.new(:name) end person = Person.new('John') redditor = Reddittor.new(person)

Slide 46

Slide 46 text

Delegator class Person < Struct.new(:name) end person = Person.new('John') redditor = Reddittor.new(person) redditor.name # => 'John'

Slide 47

Slide 47 text

Delegator class Person < Struct.new(:name) end person = Person.new('John') redditor = Reddittor.new(person) redditor.name # => 'John' redditor.submit_link # => 'Link by John'

Slide 48

Slide 48 text

Delegator require 'delegate'

Slide 49

Slide 49 text

Delegator class Redditor < Delegator def initialize(person) end end

Slide 50

Slide 50 text

Delegator class Redditor < Delegator def initialize(person) end def __setobj__(person) @person = person end def __getobj__ @person end end

Slide 51

Slide 51 text

Delegator class Redditor < Delegator def initialize(person) __setobj__(person) end def __setobj__(person) @person = person end def __getobj__ @person end end

Slide 52

Slide 52 text

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

Slide 53

Slide 53 text

Delegator person = Person.new('John') redditor = Redditor.new(person) redditor.name # => 'John' redditor.submit_link # => 'Link by John'

Slide 54

Slide 54 text

tl;dr

Slide 55

Slide 55 text

Delegator class Redditor < SimpleDelegator def initialize(person) super(person) end def submit_link "Link by #{name}" end end

Slide 56

Slide 56 text

Delegator person = Person.new('John') redditor = Redditor.new(person) redditor.name # => 'John'

Slide 57

Slide 57 text

Delegator person = Person.new('John') redditor = Redditor.new(person) redditor.name # => 'John' redditor.methods.grep(/name/) # => [:name, :name=]

Slide 58

Slide 58 text

Delegator person = Person.new('John') redditor = Redditor.new(person) redditor.name # => 'John' redditor.methods.grep(/name/) # => [:name, :name=] Redditor.instance_methods.grep(/name/) # => []

Slide 59

Slide 59 text

Delegator class Redditor < DelegateClass(Person) def initialize(person) super(person) end def submit_link "Link by #{name}" end end

Slide 60

Slide 60 text

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=]

Slide 61

Slide 61 text

Thanks! Sergey Nartimov Brainspec https://github.com/lest twitter: @just_lest