%w(kawasaki yokohama shibuya).each do |name|
  puts "#{name}.rb"
end

def block_sample
  puts 'stand up'
  yield
  puts 'sit down'
end

block_sample do
  puts 'walk'
end

block_sample

def block_sample
  puts 'stand up'
  
  yield if block_given?
  
  puts 'sit down'
end

block_sample

block_sample do
  puts 'hoge'
end

def display_value
  puts yield
end

display_value do
  next 42
end

i = display_value do
  break 42
end

puts "#{i}ですよ"