From: diego scataglini <dwebsubmit@...>
Date: 2007-07-11T22:31:00+09:00
Subject: Re: Beautiful Code : Pity he didn't ask here...

Nice, didn't know about it. Erlang has a similar thing for throwaway  
values.

Thanks James

Diego Scataglini

On Jul 10, 2007, at 9:23 AM, James Edward Gray II <james@grayproductions.net 
 > wrote:

> On Jul 10, 2007, at 8:13 AM, Gregory Brown wrote:
>
>> On 7/10/07, Wayne E. Seguin <wayneeseguin@gmail.com> wrote:
>>> On Jul 10, 2007, at 08:27 , Christoffer Sawicki wrote:
>>> > Hello.
>>> >
>>> > On 7/10/07, John Carter <john.carter@tait.co.nz> wrote:
>>> >> count.keys.sort_by{|key| count[key]}
>>> >
>>> > IMHO, the most elegant way to do this is:
>>> >
>>> > hash.sort_by { |k, v| v }.map { |k, v| k }
>>> >
>>> > ...where k = key and v = value.
>>> >
>>> > Cheers,
>>>
>>> Ack, pet peeve.
>>>
>>> hash.sort_by { | key, value | value } .map { | key, value | key }
>>>
>>> If you have to specify "where k = key and v = value" then these
>>> should have been used in your code.
>>>
>>> Always favor readability at the expense of verbosity, both your
>>> future self and whoever else maintains your code will thank you.
>>
>> I find myself always using |k,v|, when used on something hashlike I
>> don't think readability suffers.
>
> I've also recently adopted the trick of using _ as an unused  
> parameter name.  I believe it was Ara that first suggested this and  
> I think it's a great idea:
>
>  hash.sort_by { |key, _| … }…
>
> James Edward Gray II