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Code to Joy

avdi
September 15, 2012

Code to Joy

A random walk through the Ruby language and standard library, highlighting some tools and idioms that make me happy.

avdi

September 15, 2012
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  1. Code to Joy
    Avdi Grimm
    ShipRise
    GoGaRuCo 2012
    Avdi Grimm (ShipRise) Code to Joy GoGaRuCo 2012 1 / 50

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  2. Code to Joy Introduction
    Introduction
    These are a few of my favorite things.
    Avdi Grimm (ShipRise) GoGaRuCo 2012 2 / 50

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  3. Code to Joy Introduction
    My Job is Awesome
    • My job is awesome
    Avdi Grimm (ShipRise) GoGaRuCo 2012 3 / 50

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  4. Code to Joy Introduction
    My Job is Awesome
    • My job is awesome
    • Remotely pairing with many different people
    Avdi Grimm (ShipRise) GoGaRuCo 2012 3 / 50

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  5. Code to Joy Introduction
    My Job is Awesome
    • My job is awesome
    • Remotely pairing with many different people
    • Different levels of knowledge, different problems to solve
    Avdi Grimm (ShipRise) GoGaRuCo 2012 3 / 50

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  6. Code to Joy Introduction
    My Job is Awesome
    • My job is awesome
    • Remotely pairing with many different people
    • Different levels of knowledge, different problems to solve
    • ”That’s so cool, I didn’t know you could do that”
    Avdi Grimm (ShipRise) GoGaRuCo 2012 3 / 50

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  7. Code to Joy Introduction
    Ruby is Awesome
    Ruby is designed to make programmers happy.
    — Matz
    It still finds ways to make me smile after all these years.
    Avdi Grimm (ShipRise) GoGaRuCo 2012 4 / 50

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  8. Code to Joy Introduction
    Postcards are Awesome
    • Work in progress: Confident Ruby
    Avdi Grimm (ShipRise) GoGaRuCo 2012 5 / 50

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  9. Code to Joy Introduction
    Postcards are Awesome
    • Work in progress: Confident Ruby
    • ”Pay with a postcard”
    Avdi Grimm (ShipRise) GoGaRuCo 2012 5 / 50

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  10. Code to Joy Introduction
    Postcards are Awesome
    • Work in progress: Confident Ruby
    • ”Pay with a postcard”
    • Postcards make me happy!
    Avdi Grimm (ShipRise) GoGaRuCo 2012 5 / 50

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  11. Code to Joy Introduction
    The Plan
    • A random walk through the Ruby language and standard
    library. . .
    Avdi Grimm (ShipRise) GoGaRuCo 2012 6 / 50

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  12. Code to Joy Introduction
    The Plan
    • A random walk through the Ruby language and standard
    library. . .
    • . . . stopping in at some of my favorite idioms and tools. . .
    Avdi Grimm (ShipRise) GoGaRuCo 2012 6 / 50

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  13. Code to Joy Introduction
    The Plan
    • A random walk through the Ruby language and standard
    library. . .
    • . . . stopping in at some of my favorite idioms and tools. . .
    • . . . and around the world, in postcards!
    Avdi Grimm (ShipRise) GoGaRuCo 2012 6 / 50

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  14. Code to Joy Splats
    Splats
    Avdi Grimm (ShipRise) GoGaRuCo 2012 7 / 50

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  15. Code to Joy Splats
    Simple Destructuring
    spawn( ’true’ )
    pid, status = *Process.wait2
    pid # => 9159
    status # => #
    Avdi Grimm (ShipRise) GoGaRuCo 2012 8 / 50

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  16. Code to Joy Splats
    Implicit splat
    spawn( ’true’ )
    pid, status = Process.wait2
    pid # => 16804
    status # => #
    Avdi Grimm (ShipRise) GoGaRuCo 2012 9 / 50

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  17. Code to Joy Splats
    Multiple return values
    def send_request
    # ...
    code = 404
    message = "Not found"
    # ???
    end
    Avdi Grimm (ShipRise) GoGaRuCo 2012 10 / 50

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  18. Code to Joy Splats
    One client wants individual values
    code, message = send_request
    logger.info " #{ code } : #{ message } "
    Avdi Grimm (ShipRise) GoGaRuCo 2012 11 / 50

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  19. Code to Joy Splats
    Another client wants an object
    response = send_request
    case response.code
    when 400..599 then handle_error(response)
    else
    # ...
    end
    Avdi Grimm (ShipRise) GoGaRuCo 2012 12 / 50

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  20. Code to Joy Splats
    cake.have && cake.eat
    Response = Struct.new( :code , :message )
    r = Response.new(404, "Not found" )
    # Attributes:
    r.code # => 404
    r.message # => "Not found"
    # Splat:
    code, msg = *r
    code # => 404
    msg # => "Not found"
    Avdi Grimm (ShipRise) GoGaRuCo 2012 13 / 50

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  21. Code to Joy Splats
    One little problem
    Response = Struct.new( :code , :message )
    r = Response.new(404, "Not found" )
    code, msg = r # no splat
    code # => #
    msg # => nil
    Avdi Grimm (ShipRise) GoGaRuCo 2012 14 / 50

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  22. Code to Joy Splats
    An implicitly splattable Struct
    Response = Struct.new( :code , :message ) do
    alias_method :to_ary , :to_a
    end
    Avdi Grimm (ShipRise) GoGaRuCo 2012 15 / 50

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  23. Code to Joy Splats
    An implicitly splattable Struct
    Response = Struct.new( :code , :message ) do
    alias_method :to_ary , :to_a
    end
    r = Response.new(404, "Not found" )
    code, msg = r # look ma, no splat!
    code # => 404
    msg # => "Not found"
    Avdi Grimm (ShipRise) GoGaRuCo 2012 15 / 50

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  24. Code to Joy Splats
    Returning a splattable Struct
    def send_request
    # ...
    Response.new(code, message)
    end
    Avdi Grimm (ShipRise) GoGaRuCo 2012 16 / 50

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  25. Code to Joy Splats
    Splatting the Struct into component parts
    code, message = send_request
    logger.info " #{ code } : #{ message } "
    Avdi Grimm (ShipRise) GoGaRuCo 2012 17 / 50

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  26. Code to Joy Splats
    Using the response Struct as-is
    response = send_request
    case response.code
    when 400..599 then handle_error(response)
    else
    # ...
    end
    Avdi Grimm (ShipRise) GoGaRuCo 2012 18 / 50

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  27. Code to Joy Splats
    Splats & Structs
    • Return multiple values from a method. . .
    • . . . *Or* a single result object. . .
    • . . . from the same line of code. Magic!
    Avdi Grimm (ShipRise) GoGaRuCo 2012 19 / 50

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  28. Code to Joy YAML::Store
    YAML::Store
    Avdi Grimm (ShipRise) GoGaRuCo 2012 20 / 50

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  29. Code to Joy YAML::Store
    Persisting Posts
    require ’yaml/store’
    repo = YAML::Store.new( ’blog.yml’ )
    Post = Struct.new( :title , :body )
    repo.transaction do
    posts = repo[ :posts ] = []
    posts << Post.new( "F1rst Post!!!" , "FIRST" )
    posts << Post.new( "Hiatus" ,
    "This blog is on vacation" )
    end
    Avdi Grimm (ShipRise) GoGaRuCo 2012 21 / 50

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  30. Code to Joy YAML::Store
    The Persisted Data
    cat blog.yml
    ---
    :posts:
    - !ruby/struct:Post
    title: F1rst Post!!!
    body: FIRST
    - !ruby/struct:Post
    title: Hiatus
    body: This blog is on vacation
    Avdi Grimm (ShipRise) GoGaRuCo 2012 22 / 50

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  31. Code to Joy YAML::Store
    Associations
    Post = Struct.new( :title , :body , :category )
    Category = Struct.new( :name )
    food = Category.new( :food )
    repo.transaction do
    posts = repo[ :posts ] = []
    posts << Post.new( "Cookie!!!" ,
    "C is for cookie!" , food)
    posts << Post.new( "Durian" ,
    "Stinky!" , food)
    end
    Avdi Grimm (ShipRise) GoGaRuCo 2012 23 / 50

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  32. Code to Joy YAML::Store
    Associations YAML
    ---
    :posts:
    - !ruby/struct:Post
    title: Cookie!!!
    body: C is for cookie!
    category: &8509480 !ruby/struct:Category
    name: :food
    - !ruby/struct:Post
    title: Durian
    body: Stinky!
    category: *8509480
    Avdi Grimm (ShipRise) GoGaRuCo 2012 24 / 50

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  33. Code to Joy YAML::Store
    PStore
    • Drop-in replacement
    require ’pstore’
    2
    repo = PStore.new( ’blog.pstore’ )
    repo.transaction do
    4
    # ...
    end
    Avdi Grimm (ShipRise) GoGaRuCo 2012 25 / 50

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  34. Code to Joy YAML::Store
    PStore
    • Drop-in replacement
    require ’pstore’
    2
    repo = PStore.new( ’blog.pstore’ )
    repo.transaction do
    4
    # ...
    end
    • Faster
    Adding 1000 posts, with a transaction for each write:
    user system total real
    yaml 50.210000 0.210000 50.420000 ( 54.024277)
    pstore 3.290000 0.130000 3.420000 ( 10.887887)
    Avdi Grimm (ShipRise) GoGaRuCo 2012 25 / 50

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  35. Code to Joy YAML::Store
    YAML#Store
    • Incredibly simple Hash-like persistence mechanism
    • Great for local command-line apps
    • Supports complex object trees
    • Oh yeah, one more thing. . .
    Avdi Grimm (ShipRise) GoGaRuCo 2012 26 / 50

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  36. Code to Joy YAML::Store
    YAML#Store
    • Incredibly simple Hash-like persistence mechanism
    • Great for local command-line apps
    • Supports complex object trees
    • Oh yeah, one more thing. . .
    • ZOMG NOSQL!!!
    Avdi Grimm (ShipRise) GoGaRuCo 2012 26 / 50

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  37. Code to Joy Enumerators
    Enumerators
    Avdi Grimm (ShipRise) GoGaRuCo 2012 27 / 50

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  38. Code to Joy Enumerators
    Kernel#to_enum
    Convert any old method into an Enumerator
    def names
    yield ’Ylva’
    yield ’Brighid’
    yield ’Shifra’
    yield ’Yasmin’
    end
    e = to_enum( :names ) # => #
    e.to_a # => ["Ylva", "Brighid", "Shifra", "Yasmin"]
    Avdi Grimm (ShipRise) GoGaRuCo 2012 28 / 50

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  39. Code to Joy Enumerators
    Searching for config files
    + project
    |-- .rutrc
    |-- file1
    |-- file2
    |-+ subproject <-- you are here
    |-- .rutrc
    |-- file3
    \-- ...
    Avdi Grimm (ShipRise) GoGaRuCo 2012 29 / 50

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  40. Code to Joy Enumerators
    Pathname#ascend
    require ’pathname’
    Dir.chdir( ’/home/avdi/dev’ )
    Pathname.pwd.ascend do |dir|
    puts dir
    end
    /home/avdi/dev
    /home/avdi
    /home
    /
    Avdi Grimm (ShipRise) GoGaRuCo 2012 30 / 50

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  41. Code to Joy Enumerators
    Searching upwards for config files
    require ’pathname’
    curdir = Pathname.pwd
    configs = curdir.to_enum( :ascend ).
    each_with_object([]){ |dir, files|
    config = (dir + ’.rutrc’ )
    files << config if config.file?
    }
    Avdi Grimm (ShipRise) GoGaRuCo 2012 31 / 50

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  42. Code to Joy Enumerators
    Searching upwards for config files
    curdir = Pathname.pwd
    configs = curdir.to_enum(:ascend).
    each_with_object([]) { |dir, files|
    config = (dir + ’.rutrc’)
    files « config if config.file?
    }
    Avdi Grimm (ShipRise) GoGaRuCo 2012 31 / 50

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  43. Code to Joy Enumerators
    Searching upwards for config files
    curdir = Pathname.pwd
    configs = curdir.to_enum(:ascend).
    each_with_object([]) { |dir, files|
    config = (dir + ’.rutrc’)
    files « config if config.file?
    }
    Avdi Grimm (ShipRise) GoGaRuCo 2012 31 / 50

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  44. Code to Joy Enumerators
    Searching upwards for config files
    curdir = Pathname.pwd
    configs = curdir.to_enum(:ascend).
    each_with_object([]) { |dir, files|
    config = (dir + ’.rutrc’)
    files « config if config.file?
    }
    Avdi Grimm (ShipRise) GoGaRuCo 2012 31 / 50

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  45. Code to Joy Enumerators
    Enumerator and #to_enum
    • Turn any method into an iterable series
    • Make all the power of Enumerator available to the series
    Avdi Grimm (ShipRise) GoGaRuCo 2012 32 / 50

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  46. Code to Joy Break
    Give me a break
    Avdi Grimm (ShipRise) GoGaRuCo 2012 33 / 50

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  47. Code to Joy Break
    break
    It breaks out of loops. Whoop-de-doo.
    jobs.each do |job|
    break if job == :terminate
    job.call
    end
    Avdi Grimm (ShipRise) GoGaRuCo 2012 34 / 50

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  48. Code to Joy Break
    break beyond iteration
    def names
    yield ’Ylva’
    yield ’Brighid’
    yield ’Shifra’
    yield ’Yasmin’
    end
    Avdi Grimm (ShipRise) GoGaRuCo 2012 35 / 50

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  49. Code to Joy Break
    break beyond iteration
    i = 0
    names do |name|
    puts name
    break if i >= 1 # that’s plenty!
    i += 1
    end
    Ylva
    Brighid
    Avdi Grimm (ShipRise) GoGaRuCo 2012 35 / 50

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  50. Code to Joy Break
    break beyond iteration
    def names
    yield ’Ylva’
    yield ’Brighid’
    # ---- We stopped here! ----
    yield ’Shifra’
    yield ’Yasmin’
    end
    Without a return, throw, or raise.
    Avdi Grimm (ShipRise) GoGaRuCo 2012 35 / 50

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  51. Code to Joy Break
    break respects ensure blocks
    def names_with_last
    yield ’Ylva’
    yield ’Brighid’
    yield ’Shifra’
    yield ’Yasmin’
    ensure
    puts "Grimm"
    end
    Avdi Grimm (ShipRise) GoGaRuCo 2012 36 / 50

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  52. Code to Joy Break
    break respects ensure blocks
    i = 0
    names_with_last do |name|
    puts name
    break if i >= 1 # that’s plenty!
    i += 1
    end
    Ylva
    Brighid
    Grimm
    Avdi Grimm (ShipRise) GoGaRuCo 2012 36 / 50

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  53. Code to Joy Break
    break respects ensure blocks
    def names_with_last
    yield ’Ylva’
    yield ’Brighid’
    # ---- We stopped here... ----
    yield ’Shifra’
    yield ’Yasmin’
    ensure
    # ...and jumped to here.
    puts "Grimm"
    end
    Avdi Grimm (ShipRise) GoGaRuCo 2012 36 / 50

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  54. Code to Joy Break
    break with a value
    What if we want to capture a name?
    result = nil
    result = names do |name|
    if name =~ /^S/
    result = name
    break
    end
    end
    result # => "Shifra"
    Avdi Grimm (ShipRise) GoGaRuCo 2012 37 / 50

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  55. Code to Joy Break
    break with a value
    result = names do |name|
    break name if name =~ /^S/
    end
    result # => "Shifra"
    This effectively overrides the method’s return value.
    Avdi Grimm (ShipRise) GoGaRuCo 2012 37 / 50

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  56. Code to Joy Break
    Breaking from a #detect
    f = open( ’code-to-joy.org’ )
    result = f.lines.detect do |line|
    break "" if f.lineno >= 100
    line =~ /banana/
    end
    result # => ""
    Avdi Grimm (ShipRise) GoGaRuCo 2012 38 / 50

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  57. Code to Joy Subclassing Module
    Subclassing Module
    Avdi Grimm (ShipRise) GoGaRuCo 2012 39 / 50

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  58. Code to Joy Subclassing Module
    A simple RPG
    Race = Struct.new( :name , :strength )
    CharacterClass = Struct.new( :name , :charisma )
    Character = Struct.new( :name , :race , :char_class )
    human = Race.new( "Human" , 9)
    wizard = CharacterClass.new( "Tourist" , 3)
    player = Character.new( "Rhincewind" , human, wizard)
    Avdi Grimm (ShipRise) GoGaRuCo 2012 40 / 50

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  59. Code to Joy Subclassing Module
    What we’d like
    Ideally, attributes would be delegated to either race or char_class.
    player.name # => "Rhincewind"
    player.strength # => 9
    player.charisma # => 3
    Avdi Grimm (ShipRise) GoGaRuCo 2012 41 / 50

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  60. Code to Joy Subclassing Module
    Using Forwardable
    require ’forwardable’
    Character = Struct.new( :name , :race , :char_class ) do
    extend Forwardable
    def_delegators :race , :strength
    def_delegators :char_class , :charisma
    end
    Avdi Grimm (ShipRise) GoGaRuCo 2012 42 / 50

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  61. Code to Joy Subclassing Module
    Evolving with Forwardable
    Race = Struct.new( :name , :strength , :constitution )
    human = Race.new( "Human" , 9, 5)
    # ...
    Character = Struct.new( :name , :race , :char_class ) do
    extend Forwardable
    def_delegators :race , :strength , :constitution
    # ...
    end
    Every change has to be made twice.
    Avdi Grimm (ShipRise) GoGaRuCo 2012 43 / 50

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  62. Code to Joy Subclassing Module
    Using SimpleDelegator
    require ’delegate’
    class Character < SimpleDelegator
    def initialize(name, race, char_class)
    @name = name
    super(race)
    end
    # ...
    end
    Only one object supported.
    Avdi Grimm (ShipRise) GoGaRuCo 2012 44 / 50

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  63. Code to Joy Subclassing Module
    Subclassing Module
    class Delegate < Module
    def initialize(attribute)
    @attribute = attribute
    super() do
    # see next slide...
    end
    end
    end
    Avdi Grimm (ShipRise) GoGaRuCo 2012 45 / 50

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  64. Code to Joy Subclassing Module
    Subclassing Module
    # ...
    define_method( :method_missing ) do
    |message, *args, &block|
    target = send(attribute)
    if target.respond_to?(message)
    target.public_send(message, *args, &block)
    else
    super(message, *args, &block)
    end
    end
    # ...
    Avdi Grimm (ShipRise) GoGaRuCo 2012 45 / 50

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  65. Code to Joy Subclassing Module
    Subclassing Module
    # ...
    define_method(:method_missing) do
    |message, *args, &block|
    target = send(attribute)
    if target.respond_to?(message)
    target.public_send(message, *args, &block)
    else
    super(message, *args, &block)
    end
    end
    # ...
    Avdi Grimm (ShipRise) GoGaRuCo 2012 45 / 50

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  66. Code to Joy Subclassing Module
    Subclassing Module
    # ...
    define_method(:method_missing) do
    |message, *args, &block|
    target = send(attribute)
    if target.respond_to?(message)
    target.public_send(message, *args, &block)
    else
    super(message, *args, &block)
    end
    end
    # ...
    Avdi Grimm (ShipRise) GoGaRuCo 2012 45 / 50

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  67. Code to Joy Subclassing Module
    Subclassing Module
    # ...
    define_method(:method_missing) do
    |message, *args, &block|
    target = send(attribute)
    if target.respond_to?(message)
    target.public_send(message, *args, &block)
    else
    super(message, *args, &block)
    end
    end
    # ...
    Avdi Grimm (ShipRise) GoGaRuCo 2012 45 / 50

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  68. Code to Joy Subclassing Module
    Subclassing Module
    # ...
    define_method(:method_missing) do
    |message, *args, &block|
    target = send(attribute)
    if target.respond_to?(message)
    target.public_send(message, *args, &block)
    else
    super(message, *args, &block)
    end
    end
    # ...
    Avdi Grimm (ShipRise) GoGaRuCo 2012 45 / 50

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  69. Code to Joy Subclassing Module
    Subclassing Module
    class Delegate < Module
    # ...
    def to_s
    "Delegate( #{ @attribute.inspect } )"
    end
    end
    Avdi Grimm (ShipRise) GoGaRuCo 2012 45 / 50

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  70. Code to Joy Subclassing Module
    Subclassing Module
    Character = Struct.new( :name , :race , :char_class ) do
    include Delegate.new( :race )
    include Delegate.new( :char_class )
    end
    Avdi Grimm (ShipRise) GoGaRuCo 2012 45 / 50

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  71. Code to Joy Subclassing Module
    Subclassing Module
    player.class.ancestors # =>
    [Character,
    Delegate( :char_class ),
    Delegate( :race ),
    Struct, ...]
    Avdi Grimm (ShipRise) GoGaRuCo 2012 45 / 50

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  72. Code to Joy Subclassing Module
    Subclassing Module
    Race = Struct.new( :name , :strength )
    CharacterClass = Struct.new( :name , :charisma )
    # ...
    player = Character.new( "Rhincewind" , human, wizard)
    player.name # => "Rhincewind"
    player.strength # => 9
    player.charisma # => 3
    A chain of responsibility:
    1 self
    2 self.char_class
    3 self.race
    4 Other ancestors. . .
    Avdi Grimm (ShipRise) GoGaRuCo 2012 45 / 50

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  73. Code to Joy Subclassing Module
    Subclassing Module
    • Creates a new “kind” of module
    • Enables us to add state to the modules a class includes
    • Enabled us to implement a new type of message delegation in
    Ruby
    Avdi Grimm (ShipRise) GoGaRuCo 2012 46 / 50

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  74. Code to Joy MINASWAN
    My Favorite Thing of All
    MINASWAN
    Avdi Grimm (ShipRise) GoGaRuCo 2012 47 / 50

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  75. Code to Joy Conclusion
    Sometimes we get discouraged
    • Technical debt got you down?
    Avdi Grimm (ShipRise) GoGaRuCo 2012 48 / 50

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  76. Code to Joy Conclusion
    Sometimes we get discouraged
    • Technical debt got you down?
    • Community drama bumming you out?
    Avdi Grimm (ShipRise) GoGaRuCo 2012 48 / 50

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  77. Code to Joy Conclusion
    Sometimes we get discouraged
    • Technical debt got you down?
    • Community drama bumming you out?
    • If you’re blue, don’t know where to go to. . .
    Avdi Grimm (ShipRise) GoGaRuCo 2012 48 / 50

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  78. Code to Joy Conclusion
    Sometimes we get discouraged
    • Technical debt got you down?
    • Community drama bumming you out?
    • If you’re blue, don’t know where to go to. . .
    • . . . practice joyful coding
    Avdi Grimm (ShipRise) GoGaRuCo 2012 48 / 50

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  79. Code to Joy Conclusion
    Sometimes we get discouraged
    • Technical debt got you down?
    • Community drama bumming you out?
    • If you’re blue, don’t know where to go to. . .
    • . . . practice joyful coding
    • How?
    Avdi Grimm (ShipRise) GoGaRuCo 2012 48 / 50

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  80. Code to Joy Conclusion
    Defend your joy
    • There’s no metric for joyful code
    Avdi Grimm (ShipRise) GoGaRuCo 2012 49 / 50

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  81. Code to Joy Conclusion
    Defend your joy
    • There’s no metric for joyful code
    • Shared code is joyful code
    Avdi Grimm (ShipRise) GoGaRuCo 2012 49 / 50

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  82. Code to Joy Conclusion
    Defend your joy
    • There’s no metric for joyful code
    • Shared code is joyful code
    • If you want to feel good about your craft. . .
    Avdi Grimm (ShipRise) GoGaRuCo 2012 49 / 50

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  83. Code to Joy Conclusion
    Defend your joy
    • There’s no metric for joyful code
    • Shared code is joyful code
    • If you want to feel good about your craft. . .
    • . . . give someone a “wow” moment.
    Avdi Grimm (ShipRise) GoGaRuCo 2012 49 / 50

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  84. Code to Joy Conclusion
    Defend your joy
    • There’s no metric for joyful code
    • Shared code is joyful code
    • If you want to feel good about your craft. . .
    • . . . give someone a “wow” moment.
    • Show one person something awesome.
    Avdi Grimm (ShipRise) GoGaRuCo 2012 49 / 50

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  85. Code to Joy Conclusion
    Defend your joy
    • There’s no metric for joyful code
    • Shared code is joyful code
    • If you want to feel good about your craft. . .
    • . . . give someone a “wow” moment.
    • Show one person something awesome.
    • I promise you’ll feel better!
    Avdi Grimm (ShipRise) GoGaRuCo 2012 49 / 50

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  86. Code to Joy Conclusion
    Thank You
    • Rate! http://spkr8.com/t/16041
    • Contact! [email protected]
    • Tweet! @avdi
    • Read! http://confidentruby.com
    • 20% off: GOGARUCO2012
    • . . . or send me a postcard!
    Avdi Grimm (ShipRise) GoGaRuCo 2012 50 / 50

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