lazy確認

lazy_map.rb

class Hoge
  attr_accessor :body

  def initialize(body)
    @body = body
  end

  def squisher
    pp "i squished #{@body}"
    @body.squish
  end

  def gsuber
    pp "i gsub #{@body}"
    @body.gsub(/[[:space:]]/, '')
  end
end

hoges=[Hoge.new(" 123"),Hoge.new("1 23"),Hoge.new("12 3"),Hoge.new("123  "),Hoge.new("1 2 3")].map{|m|m.squisher}.uniq
hoges.include?('1huga')

lazy_hoges=[Hoge.new(" 123"),Hoge.new("1 23"),Hoge.new("12 3"),Hoge.new("123  "),Hoge.new("1 2 3")].lazy.map{|m|m.squisher}.uniq
lazy_hoges.include?('1huga')

hoges=[Hoge.new(" 123"),Hoge.new("1 23"),Hoge.new("12 3"),Hoge.new("123  "),Hoge.new("1 2 3")].map{|m|m.gsuber}.uniq
hoges.include?('1huga')

lazy_hoges=[Hoge.new(" 123"),Hoge.new("1 23"),Hoge.new("12 3"),Hoge.new("123  "),Hoge.new("1 2 3")].lazy.map{|m|m.gsuber}.uniq
lazy_hoges.include?('1huga')