From: Simon Strandgaard <neoneye@...>
Date: 2004-02-20T20:21:15+09:00
Subject: Re: proposal: let kind_of take more arguments

On Thu, 19 Feb 2004 09:30:16 -0700, Ara.T.Howard wrote:
> On Thu, 19 Feb 2004, Simon Strandgaard wrote:
>> From: Simon Strandgaard <neoneye@adslhome.dk>
>> On Thu, 19 Feb 2004 08:19:33 -0700, Ara.T.Howard wrote:
>> > 
>> > what do you reccomend (when a case won't do) ?
>> > 
>> > ...
>> >   unless choice.kind_of?(Zero) or choice.kind_of?(One)
>> > ...
>> > 
>> 
>> My brain is terrible at dealing with 'unless'.
>> If its just "unless something" then its ok.
>> But when its "unless a or b and c" then it chokes.
>> 
>> Am I the only one feeling like this?
>> 
>> Where can I seek help ?  ;-)
> 
> a digital logic book, the simplest, will help.  de morgan's laws..., eg.
[snip talk about de morgans law]

Yes I know these rules.. also karnough maps helps gaining overview of
boolean operations. When an expression gets too complex then I like 
place a comment with the corresponding karnough map. 

What I should have said was that I grew up with 'if then else'.
The 'unless' keyword is a recent addition to my vocabulary, I am still 
a bit rusty in its usage.

--
Simon Strandgaard