• yield

yield

irb(main):001:1* def hello_world
irb(main):002:1*   puts "hello"
irb(main):003:1*   yield
irb(main):004:1*   yield
irb(main):005:1*   puts "world!"
irb(main):006:0> end
=> :hello_world
irb(main):007:0> hello_world {puts ","}
hello
,
,
world!
=> nil

def hello_name
  puts "...."
  yield ("zhangsang")
end
hello_name {|name| puts "hello,#{name}"}

def hello_name
  puts "...."
  yield ("zhangsang")
end
hello_name do
  |name|
  puts "hello,#{name}"
end

....
hello,zhangsang