From: Marnen Laibow-Koser <marnen@...>
Date: 2009-11-10T00:49:07+09:00
Subject: Re: RCR enumerable extra into core

Roger Pack wrote:
> 
>>> which is arguably less readable.
>>> Thoughts?
>> 
>> At the same time, the merit of &:name over :name is that &:name does
>> tell you what's going on, once you know that the & in front of any
>> object (symbol or otherwise) in last-argument position means that the
>> object will be converted to a Proc and play the block role.
> 
> Hmm.  I suppose I'm of a slightly different opinion--to me
> list.map &:symbol
> 
> is less clear than
> list.map(:symbol)
> 
> 
> If we were required to write
> list.map &:symbol.to_proc

But we are.  &:symbol is equivalent to :symbol.to_proc.  So the & form 
is explicit -- and thus arguably clearer.  I would almost expect 
list.map :symbol to return :symbol for each item in list.

> 
> then I would be more easily convinced that list.map(:symbol) is too 
> implicit.  So for me it's implicit already.

Because you're misunderstanding the syntax.

> 
> I'm not too worried about the run time slowdown...so many methods are 
> already special cased...it doesn't seem to be a too large concern to the 
> core guys...
> 
> -r

Best,
--
Marnen Laibow-Koser
http://www.marnen.org
marnen@marnen.org
-- 
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