From: Gennady <gfb@...>
Date: 2004-02-05T02:15:07+09:00
Subject: Re: RCR draft for enhanced "case..when..else..end" syntax

Austin Ziegler wrote:
> On Wed, 4 Feb 2004 01:00:25 +0900, Gennady wrote:
> 
>>Guoliang Cao wrote:
>>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
> 
> 
> What you've written here will do alternatives checks. Thus, if you have:
> 
> a = "aaa"
> b = "BBB"
> 
> then "Lowercase detected" will be printed. With "AAA" and "bbb", "Lowercase 
> detected" will still be printed.

Nice investigative job ;-). But remember that it was only a quick 
demonstration of a "hidden" case syntax.

> 
> irb(main):001:0> def ct(a, b)
> irb(main):002:1>   case
> irb(main):003:2*     when a == "aaa", b == "bbb"
> irb(main):004:2>       puts "Lowercase"
> irb(main):005:2>     when a == "AAA", b == "BBB"
> irb(main):006:2>       puts "Uppercase"
> irb(main):007:2>     else
> irb(main):008:2*       puts "Failed"
> irb(main):009:2>   end
> irb(main):010:1> end # => nil
> irb(main):011:0> ct("aaa", "bbb") # Lowercase => nil
> irb(main):012:0> ct("aaa", "BBB") # Lowercase => nil
> irb(main):013:0> ct("AAA", "BBB") # Uppercase => nil
> irb(main):014:0> ct("AAA", "bbb") # Lowercase => nil
> 
> -austin
> --
> austin ziegler    * austin@halostatue.ca * Toronto, ON, Canada
> software designer * pragmatic programmer * 2004.02.04
>                                          * 11.53.52
> 
> 
> 

Gennady.