From: Justin Collins <collinsj@...>
Date: 2006-04-14T03:33:00+09:00
Subject: Re: Question mark in attr_*

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Patrick Hurley wrote:
> 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
>   
Okay, makes sense.

Thanks,

Justin

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