siman-man

def test(str)
  puts str
end

test(<<EOS)
Hello World.
  This is a pen.
    これはテストです
EOS

siman-man

class Filter
  class << self
    def run(&block)
      self.new.instance_eval(&block)
    end
  end

  def method_missing(name, *args)
    { method: name, args: args }
  end

siman-man

ip = "192.168.10.1"
answer = []

ip.split('.').map(&:to_i).each do |num|
  answer << "%08d" % num.to_s(2)
end

puts answer.join('.')

siman-man

ip = "11000000.10101000.00001010.00000001"
answer = []

ip.split('.').each do |num|
  answer << num.to_i(2)
end

puts answer.join('.')

siman-man

DATA.each do |ip|
  answer = []
 
  ip.split('.').map(&:to_i).each do |num|
    answer << "%08d" % num.to_s(2)
  end
 
  puts answer.join('.')
end

siman-man

a = 1
b = 1

puts a,b
10.times do
  puts a+b
  a,b = b, a+b
end

siman-man

class Hoge
  def initialize(word="piyo")
    @word = word
  end

  def to_s
    @word
  end
end

siman-man

def method_missing(name, *args)
  if args.length.zero?
    name.to_s
  else
    puts [name.to_s, args.first].join(' ')
  end
end

山田 太郎
鈴木 一郎

siman-man

5.times do
  num = [*('1000'..'9999')].sample
  num_list = num.chars
  puts "#{num} => #{num_list.join(" + ")} = #{num_list.map(&:to_i).inject(:+)}"
end

siman-man

require 'benchmark'

Benchmark.bm do |x|
  str = "Ruby"
  num = 5000000

  x.report(:split) do
    num.times{ str.split('').each(&:upcase) }
  end