From: Brian Candler <b.candler@...>
Date: 2009-01-27T19:58:40+09:00
Subject: Re: Time Compare

Robert Klemme wrote:
> is_between = now > yesterday and now < tomorrow

Danger danger!!!

irb(main):012:0> foo = 3 > 1 and 3 < 2
=> false
irb(main):013:0> foo
=> true

'and' and 'or' have lower precedence even than '=', so it's parsed as

  (foo = 3 > 1) and (3 < 2)

The moral is: don't use these very-low precedence operators unless you 
really know what you're doing. And even then, use parentheses to be 
sure. Learned the hard way :-)

Regards,

Brian.
-- 
Posted via http://www.ruby-forum.com/.