From: Rick DeNatale <rick.denatale@...>
Date: 2008-07-11T07:36:56+09:00
Subject: Re: Map with &:method_name

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On Thu, Jul 10, 2008 at 5:22 PM, ara.t.howard <ara.t.howard@gmail.com>
wrote:

>
> On Jul 10, 2008, at 3:11 PM, Oliver Saunders wrote:
>
>  I see this a lot but it doesn't work for me in IRB. Is a gem required or
>> something?
>>
>>  [1,2,3].map(&:to_s)
>>>>
>>> TypeError: wrong argument type Symbol (expected Proc)
>>       from (irb):2
>>
>
>
> it's rails - basically
>
>
> class Symbol
>  def to_proc
>    sym = self
>    lambda{|obj| obj.send sym}
>  end
> end
>

And it's been picked up in Ruby 1.9, and maybe 1.8.7 as well since the
current draft of the Pickaxe  3rd ed doesn't label it as 1.9 only.


-- 
Rick DeNatale

My blog on Ruby
http://talklikeaduck.denhaven2.com/

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