Feature #2691

RCR: allow {select, collect, map} to accept symbol argument

Added by Yuki Sonoda about 2 years ago. Updated 10 months ago.

[ruby-core:27967]
Status:Rejected Start date:
Priority:Low Due date:
Assignee:Yukihiro Matsumoto % Done:

0%
Category:-
Target version:-

Description

This reply registers the suggestion by Roger to the redmine.

and -1 because a method name is not a method itself.
Symbol#to_proc is the limit I can accept.

On Sat, Jan 30, 2010 at 10:14 AM, Roger Pack <rogerdpack2@gmail.com> wrote:
> Background.
>
> Currently in order to avoid using braces and to use select/map et al,
> one must do
>
> collection.map &:symbol
>
> This is quite explicit, which is good, however the syntax is somewhat
> ugly, which is surprising (mostly because the punctuation is
> somewhat...hard to read, at least for this Ruby reader).
>
> Suggestion:
>
> Allow map/etc al to accept a single argument, and convert it implicitly to proc.
>
> collection.map(:symbol)
>
> This reads more easily.
>
> Another option would be to add map_by(arg) and collect_by(arg)
>
> which would actually be more preferable, as least for me.
>
> Thoughts?
> Thanks.
> -r
>
>



-- Yuki Sonoda (Yugui)

History

#1
Updated by Yusuke Endoh about 2 years ago

Hi,

2010/1/30 Yugui <yugui@yugui.jp>:
> This reply registers the suggestion by Roger to the redmine.
>
> and -1 because a method name is not a method itself.
> Symbol#to_proc is the limit I can accept.

While I agree with Yugui, Array#inject accepts a Symbol.
I dislike the behavior of inject.

-- 
Yusuke ENDOH <mame@tsg.ne.jp>

#2
Updated by Ryan Davis about 2 years ago

On Jan 30, 2010, at 00:10 , Yugui wrote:

> This reply registers the suggestion by Roger to the redmine.
> 
> and -1 because a method name is not a method itself.
> Symbol#to_proc is the limit I can accept.

I completely agree on this point. I want something explicit, not magic.

#3
Updated by Rick DeNatale about 2 years ago

On Sun, Jan 31, 2010 at 5:28 PM, Ryan Davis <ryand-ruby@zenspider.com> wrote:
>
> On Jan 30, 2010, at 00:10 , Yugui wrote:
>
>> This reply registers the suggestion by Roger to the redmine.
>>
>> and -1 because a method name is not a method itself.
>> Symbol#to_proc is the limit I can accept.
>
> I completely agree on this point. I want something explicit, not magic.

I agree as well.  -1 on Roger's suggestion.


-- 
Rick DeNatale

Blog: http://talklikeaduck.denhaven2.com/
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#4
Updated by ujihisa . about 2 years ago

  • Status changed from Open to Assigned
  • Assignee set to Yukihiro Matsumoto

#5
Updated by Yusuke Endoh almost 2 years ago

  • Status changed from Assigned to Rejected
Hi,

This ticket got four -1s, and there is no rebuttal.
So I close this ticket.


FYI, matz stated the rationale (in Japanese).  [ruby-dev:32692]
He thought that "inject with Symbol" directly expressed the
intention of Array#inject, and that "map with Symbol" did not.
But he also said he might change of heart in the future.
I advise you guys to lobby matz patiently :-)

-- 
Yusuke Endoh <mame@tsg.ne.jp>

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