From: Brian Candler <b.candler@...>
Date: 2011-05-08T23:45:45+09:00
Subject: Re: Help with while condition OR condition

7stud -- wrote in post #997311:
> In ruby, everyone should use 'and' and 'or' by default instead of && and
> ||.

I would advise exactly the opposite: there are many traps for the unwary 
if you use 'and' and 'or'. Two prime examples:

>> val = 10
=> 10
>> ok = val < 3 or val > 5
=> true
>> ok
=> false

>> a = true
=> true
>> b = not a
SyntaxError: compile error
(irb):7: syntax error, unexpected kNOT

Use '||' and '!' respectively and you won't have a problem.

-- 
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