From: botp <botpena@...>
Date: 2010-01-01T21:30:03+09:00
Subject: Re: Why can't I use "or" here?

On Thu, Dec 31, 2009 at 3:13 PM, Jeff Peng <jeffpeng@netzero.net> wrote:
> I know Perl, but I'm still surprised.
>
> # perl -le 'print undef or 4'
>
> # perl -le 'print(undef or 4)'
> 4

do not be surprise, ruby opted for the former case since it is more
common, and therefore has relegated the "or/and" ops w very low
precedence level (and ergo different fr their sibling ops "||/&&")

in other words, if you see a method like

>> puts 1,2 or 4
1
2
=> 4

it actually means

>> puts( 1,2) or 4
1
2
=> 4

and if you write a  statement like

>> puts( 1,2 or 4)

ruby will err for you
but friendly enough to allow you to by (re)emphasizing...

so maybe you meant

>> puts( 1, (2 or 4))


best regards
-botp