ohnishiakira

web: bundle exec rackup config.ru -p $PORT
hello: echo "Hello, world"

ohnishiakira

#!/usr/bin/env rvm 2.0.0 do ruby
# coding: utf-8

p $;
#=> nil

p 'hoge fuga homu  '.split(nil)
#=> ["hoge", "fuga", "homu"]

p $; = /\t/

ohnishiakira

#!/usr/bin/env ruby
# coding: utf-8

class Fixnum 
  define_method "+-" do |other|
    self-other .. self+other
  end
end

p 3.send("+-", 3)

ohnishiakira

# coding: utf-8

class Hoge
  module DefaultConstants
    FUGA = 3
    HOMU = 4
  end
  
  include DefaultConstants
  

ohnishiakira

#!/usr/bin/env rvm 2.0.0 do ruby

def hoge(h, o)
  p [h, o]
end

def fuga(h: 1, o: 1)
  p [h, o]
end

ohnishiakira

#!/usr/bin/env ruby
# coding: utf-8

def parse_attr(params)
  Hash[params.map{|_|_.split(":").zip([:to_sym, :to_s]).map{|_,__|[_,__].inject(:send)}}]
end

params = ['rake:app', 'hoge:fuga']

p parse_attr(params)

ohnishiakira

#!/usr/bin/env ruby
# coding: utf-8

class Object
  def idempotent
    self
  end
end

str = "hoge"

ohnishiakira

class Hoge
  def to_s
    inspect
  end
end

p Hoge.new
#=> stack level too deep (SystemStackError)

ohnishiakira

#!/usr/bin/env ruby
# coding: utf-8 

require "nokogiri"

document = Nokogiri::XML::Builder.new do |doc|
  doc.RootNode {
    doc.ChildElement.hoge.fuga!.pero "Text in ChildElement"
    doc.SecondChildElement(class: 'hoge', id: 'fuga')
  }

ohnishiakira

#!/usr/bin/env ruby
# coding: utf-8

class String
  def invert
    return self unless self.split(//).uniq.length == 2
    str  = self
    a, b = str.split(//).uniq
    tmp  = ([*"a".."z"] - [a, b]).first