From: Tim Hunter <cyclists@...>
Date: 2006-03-26T07:29:06+09:00
Subject: Re: Bug: Syntax error when using 'or' keyword

Pistos Christou wrote:
> 
> Is there documentation anywhere which describes when to use the English 
> words versus the symbols, and why?  All I know is that the words have 
> far lower precedence, but up to this point, I have been using them in 
> favour of the symbols whenever possible, using parentheses to force 
> evaluation order.
> 
> More and more, though, I feel "discriminated against" by the language, 
> in that I should always be using the symbols.
> 
> Pistos
> 

The "Expressions" section in Chapter 22 of the Pickaxe, 2nd. ed., 
contains a table of the Ruby operators in precedence order and, in the 
"Boolean Expressions" section, some prose that explains the and, &&, or, 
||, not and !, and defined? operators.