Amazing ruby: block & yield

之前听Anand讲用了ruby以后就不想用java了，如今看来还真是。Ruby里面有好多神奇的function，先小记一下block&yield

简单来说，ruby允许把一整个statement以parameter的形式放在block中传递，目标method通过yield运行这些statement.

基本用法，Eg.

def test
   puts "You are in the method"
   yield
   puts "You are again back to the method"
   yield
end
test {puts "You are in the block"}

运行结果：

You are in the method
You are in the block
You are again back to the method
You are in the block

block中的command也允许有一到多个参数存在

test {|a, b| statement}

yield a, b

更多见tutorial: http://www.tutorialspoint.com/ruby/ruby_blocks.htm