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ruby-refinements
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to4iki
September 07, 2014
Programming
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76
ruby-refinements
http://ruby-doc.org/core-2.1.1/doc/syntax/refinements_rdoc.html
to4iki
September 07, 2014
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Transcript
Ruby2.1 Refinements Λ৮ͬͯΈͨ Toshiki Takezawa @to4iki
What is Refinements
refinement: ચ࿅, վળ
“ࢦఆͨ͠moduleͷதͰ͚ͩɺ ಛఆͷclassͷmethod Λࠩ͠ସ͑Δػೳ”
open class
RubyStringͳͲͷbuiltin class ΛؚΊطଘͷclassmethodΛ Ճɾ্ॻ͖͢Δ͜ͱ͕Ͱ͖Δ
class String def hello
"#{self} hello!" end end puts 'hoge'.hello #=> 'hoge hello!' puts 'fuga'.hello #=> 'fuga hello!'
Monkey Patch
open classͰطଘͷmethod Λஔ͖͑Δ͜ͱ
class String def length
5 end define_method :to_i, -‐> { "#{self} convert number" } end puts 'a'.length #=> 5 puts 'javascript'.length #=> 5 puts '0'.to_i #=> '0 convert number' puts 'hoge'.to_i #=> 'hoge convert number'
powerful!! but danger!!
طଘclassΛࢥ͍ͷ··मਖ਼Ͱ͖Δརศੑ ϧʔϧΛഁյͯ͠͠·͏ةݥੑ programશମʹӨڹΛ༩͑ͯ͠·͏ةݥੑ
it is a turn of refinements!
Demo
ex. Ϣʔβ͕࿈ଓͰϩάΠϯ͠ ͍ͯΔ͔Ͳ͏͔ΛΓ͍ͨ࣌
module TimeExtensions refine Time do
def changed_date? self.beginning_of_day < Time.zone.now.beginning_of_day end end end class User < ActiveRecord::Base using TimeExtensions def login! if self.login_at.changed_date? # add login bonus end end end
“Ruby܅Λ৴པ͢Δɻ Ruby܅Λผͷ͋ΔϓϩάϥϚͱͯ͠ѻ͏ɻ RubyϝλϓϩάϥϛϯάͷΑ͏ͳڧྗͳྗΛ༩͑Δɻ ͨͩ͠ɺେ͍ͳΔྗʹɺେ͍ͳΔ͕͏͜ͱΛ Ε͍͚ͯͳ͍” -ʮϝλϓϩάϥϛϯάRubyʯংจΑΓ
Thanks.