From: Gennady <gfb@...>
Date: 2004-02-05T00:52:25+09:00
Subject: Re: RCR draft for enhanced "case..when..else..end" syntax

Sam Roberts wrote:
> Quoteing bob.news@gmx.net, on Wed, Feb 04, 2004 at 05:35:03PM +0900:
> 
>>>>>Do you know about this syntax currently available?
>>>>>
>>>>>a = "aaa"
>>>>>b = "bbb"
>>>>>case
>>>>>  when a == "aaa", b == "bbb"
>>>>>    puts "Lowercase detected"
>>>>>  when a == "AAA", b == "BBB"
>>>>>    puts "Uppercase detected"
>>>>>  else
>>>>>    puts "Detection failed"
>>>>>end
>>
>>I couldn't find it in the Pickaxe - I'll file it under "Hidden Treasures
>>of Ruby"... :-)
> 
> 
> There's a lot of info jammed into the corners of the pickaxe book!
> 
> For this syntax, there's an example in the section "Case Expressions",
> p84, and then in chapter 18 it shows the syntax:
> 
> case target
>   when comparison [, comparison]]... [then]
>     body
>   when comparison [, comparison]]... [then]
>     body
>   ...
>   [ else
>       body ]
> end
> 
> 
> Cheers,
> Sam
> 
> 
We are not talking about general "case" syntax, most of folks here are 
well aware of it (thanks for refreshing it anyway ;-)). It is rather 
about a special case when <target> is not specified in "case" clause. It 
looks like it defaults to "true" so that <comparison> may contain 
logical operators like "a == <something>". And I could not find it 
mentioned in the Pickaxe either.

Gennady.