From: Alex Young <alex@...>
Date: 2007-11-16T07:19:55+09:00
Subject: Re: (1..5) === 3 > true 3 === (1..5) > false

Phrogz wrote:
> On Nov 15, 2:56 pm, Michael Chow <nanost...@magma.ca> wrote:
>> I know it's a method, but why doesn't Fixnum's === work properly with
>> ranges?
>>
>> That should be the expected behavior, the expression is just as true one
>> way as it is the other.
> 
> What do you think "===" means? Hint: it's not the same as "==", or
> "<<". And it doesn't mean "is equals to". Obviously (1..5) does not
> equal 3.
> 
> The #=== method is called in case statements, and it is up to each
> class to define something reasonable.
> 
> case 3
>   when 1..5
>     puts "(1..5) === 3 means 3 is inside the range."
>   when Integer
>     puts "Integer === 3 means that 3 is a sort of Integer"
> end
> 

Mentally, I parse "===" as "contains".  That requires a little mental 
judo for RegExps, but that's a good thing :-)

-- 
Alex