From: Joel VanderWerf <vjoel@...>
Date: 2006-03-20T07:32:15+09:00
Subject: Re: [ ruby-Bugs-3843 ] "not" operator used in expression that is a method parameter can generate syntax error

Evan Phoenix wrote:

> The same goes for your examples though. Now, I'd agree that at first,
> the fact that "and" is different from "&&" is a bit.. strange. But
> remember that it seems from the fact that "and" is a parser directive
> that creates an actual AND node in the AST. Where as, && is simply a
> binary operator, and thus a normal method call.

Actually, it is "&" that can be defined as a method. You are free define
an "&&" method, but it will not be used as expected:

irb(main):002:0> class Foo
irb(main):003:1> define_method "&&" do puts "HAHA"; end
irb(main):004:1> end
=> #<Proc:0xb7b14b48@(irb):3>
irb(main):005:0> foo = Foo.new
=> #<Foo:0xb7b128fc>
irb(main):006:0> foo && 123
=> 123
irb(main):007:0> foo.send("&&", 123)
HAHA
=> nil

-- 
      vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407