From: Daniel DeLorme <dan-ml@...42.com>
Date: 2008-01-30T10:06:02+09:00
Subject: Re: neat idea from arc

Marcel Molina Jr. wrote:
> On Jan 29, 2008, at 4:07 PM, "Martin DeMello" <martindemello@gmail.com> 
>> So we can write, for instance
>>
>> ints = input.select Integer
> 
> You can do that with grep.
> 
> [1, :foo].grep Fixnum
> # => [1]

Oh wow, I never knew you could do that. That means we can also do:
 >> [2,4,6,7].grep(1..5)
=> [2, 4]

But still, I think the point of the OP was that this idiom should also 
be available for the other methods (reject, partition, any?, all? ...)

Daniel