From: MenTaLguY <mental@...>
Date: 2007-03-01T04:54:57+09:00
Subject: Re: Ruby's "case" doesn't behave like a normal switch

On Thu, 1 Mar 2007 04:36:39 +0900, Pit Capitain <pit@capitain.de> wrote:
>> catch(:redo) do
>>   case a
>>   when 1
>>     print '1'
>>     a = 2
>>     redo
>>   when 2
>>     puts 'and 2'
>>   end
>> end

> I didn't know the "catch(:redo)". Is this documented somewhere?

It doesn't have to be catch(:redo) specifically, and in fact its use may be misleading -- here, catch is simply being used to introduce an iteration context.  For example, this works just as well:

  def foo ; yield ; end

  a = 1
  foo do
    case a
    when 1
      print '1'
      a = 2
      redo
    when 2
      puts 'and 2'
    end
  end

-mental