From: Marko Schulz <in6x059@...>
Date: 2001-04-27T15:34:17+09:00
Subject: [ruby-talk:14299] Re: || .. or Question

On Fri, Apr 27, 2001 at 09:51:25AM +0900, Yukihiro Matsumoto wrote:
> Hi,
> 
> In message "[ruby-talk:14268] Re: || .. or Question"
>     on 01/04/27, Marko Schulz <in6x059@public.uni-hamburg.de> writes:

[ Original problem: 'puts (n == 3 or n == 5)' gives a parse error, 
  'puts (n == 3 || n == 5)' does work as expected.                  ]

> |Why is 'n == 3 or n == 5' not an expression? And 
> |why is 'n == 3 || n == 5' on the other hand one? 
> 
> Simply precedence reason.  In Ruby, statements are expressions that
> can't be fit in argument list. 

Does this mean, that Ruby has an 'list operator' similar to perl with
precedence between '||' and 'or'? Otherwise I still don't understand
how precedence comes in here.

And I didn't read this in 'Programming Ruby' yet.

>   print a or b  #=> print(a) or b
>   print a || b  #=> print(a||b)

That case is quite clear. 

The trouble strikes with parenthesis around the 'a or/|| b'. Looks
like other languages do an implicit expression grouping for method
arguments with parenthesis around them. I find this to be the expected
behaviour too. 

Does anybody see incompatibilities if this was done in ruby too? Other
objections?

-- 
marko schulz

                          Dieser Satz beinhalten drei Fehller.