From: Patrick Hurley <phurley@...>
Date: 2006-04-14T03:25:04+09:00
Subject: Re: Question mark in attr_*

On 4/13/06, Mike Fletcher <lemurific+rforum@gmail.com> wrote:
> Justin Collins wrote:
> [...]
> > This could be pretty handy...but I don't understand why you have the
> > double negation?
> >>    define_method("#{sym}?") { !!instance_variable_get("@#{sym}") }
>
>
> Maybe so the first ! coerces to a true or false, and the second flips it
> back to the proper value (so you can set it with whatever value, but the
> accessor will always return true or false).
>
>
>
> --
> Posted via http://www.ruby-forum.com/.
>
>

Exactly -- you could remove it all together, but this way the method
always returns true/false regardless of the value of the property.

pth