From: "Hal E. Fulton" <hal9000@...>
Date: 2002-12-08T08:24:51+09:00
Subject: Re: elseif?

----- Original Message ----- 
From: "Joel VanderWerf" <vjoel@PATH.Berkeley.EDU>
To: "ruby-talk ML" <ruby-talk@ruby-lang.org>
Sent: Saturday, December 07, 2002 3:18 PM
Subject: Re: elseif?


> Hal E. Fulton wrote:
> ...
> > Well, I too prefer "elseif" to "elsif" -- but I don't see
> > that it will be added, and it's a very minor point.
> > 
> > Actually, what I've always wished for is a multiway Boolean
> > branch that was *obviously* such, not merely a special case
> > of 'if'.
> 
> How 'bout this:
> 
> x = 1.5
> 
> case true
>    when x < 0;             puts "x < 0"
>    when 0 <= x && x < 1;   puts "x in interval [0,1)"
>    when 1 <= x && x < 2;   puts "x in interval [1,2)"
>    when 2 <= x;            puts "x >= 2"
> end

In essence, that's what I'm talking about. But the
way it's expressed here makes it seem even more
foreign than cascading if/elsifs.

I've just always wished a language provided direct
support for such a construct. But I've never run
across anyone else who wished for it.

> 
> Sorta like cond in lisp...

Probably. I don't know LISP. Still thinking of
learning it someday -- along with FORTH, Latin,
and Esperanto...

Hal