From: Jeff Peng <jeffpeng@...>
Date: 2009-12-31T16:13:13+09:00
Subject: Re: Why can't I use "or" here?

botp :
> On Thu, Dec 31, 2009 at 10:24 AM, Albert Schlef <albertschlef@gmail.com> wrote:
>> Why? I thought the only diference between "or" and "||" is the
>> precedence.
> 
> yes, so you can do eg
> 
>>> system "pwd" or raise "no command here"
> /home/botp
> => true
> 
>>> system "asdf" or raise "no command here"
> RuntimeError: no command here
> 
> if you know perl, this is no surprise..
> 

I know Perl, but I'm still surprised.

# perl -le 'print undef or 4'

# perl -le 'print(undef or 4)'
4

# irb
irb(main):001:0> puts nil or 4

=> 4
irb(main):002:0> puts(nil or 4)
SyntaxError: (irb):2: syntax error, unexpected keyword_or, expecting ')'
puts(nil or 4)
            ^
         from /usr/bin/irb:12:in `<main>'



And if I "puts (nil or 4)" (there is a blank between them) will print 4.
(Just my thought,I was thinking this is a bug.)

Regards,
Jeff.