From: Fuad Saud <fuadksd@...>
Date: 2014-01-02T20:21:39-08:00
Subject: [ruby-core:59495] Re: [ruby-trunk - Feature #9347][Open] Accept non callable argument to detect

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I think, if it was possible, a call like this `ary.detect(:sym)` would make=
 more sense by using case equality for comparison instead of #call. It =
would be useful with regexes for example. There's a ticket proposing this =
but I can't seem to find it.=E2=80=94
Sent from Mailbox for iPhone

On Thu, Jan 2, 2014 at 8:38 PM, marcandre (Marc-Andre Lafortune)
<ruby-core@marc-andre.ca> wrote:

> Issue #9347 has been reported by marcandre (Marc-Andre Lafortune).
> ----------------------------------------
> Feature #9347: Accept non callable argument to detect
> https://bugs.ruby-lang.org/issues/9347
> Author: marcandre (Marc-Andre Lafortune)
> Status: Open
> Priority: Normal
> Assignee: matz (Yukihiro Matsumoto)
> Category: core
> Target version: current: 2.2.0
> Currently, the only argument that `Enumerable#detect` accepts is a =
callable object.
> Shouldn't we accept non callable objects too=3F
>     [42].detect(:not=5Ffound){} # =3D> NoMethodError: undefined method =
`call' for :not=5Ffound:Symbol
>      # would return :not=5Ffound instead.
> I'd suggest that if the given argument does not `respond=5Fto=3F :call`, =
then it would be returned as is instead of raising an error as currently.
> Wouldn't this be more flexible and possibly more performant=3F
> Inspired by http://stackoverflow.com/questions/20883414/why-does-enumerab=
ledetect-need-a-proc-lambda
> --=20
> http://bugs.ruby-lang.org/
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<span id=3D=22mailbox-conversation=22>I think, if it was possible, a call =
like this `ary.detect(:sym)` would make more sense by using case equality =
for comparison instead of #call. It would be useful with regexes for =
example. There's a ticket proposing this but I can't seem to find it.=
</span><div class=3D=22mailbox=5Fsignature=22>=E2=80=94<br>Sent from <a =
href=3D=22https://www.dropbox.com/mailbox=22>Mailbox</a> for iPhone</div>
<br><br><div class=3D=22gmail=5Fquote=22><p>On Thu, Jan 2, 2014 at 8:38 PM,=
 marcandre (Marc-Andre Lafortune) <span dir=3D=22ltr=22>&lt;<a =
href=3D=22mailto:ruby-core@marc-andre.ca=22 target=3D=22=5Fblank=22>ruby-co=
re@marc-andre.ca</a>&gt;</span> wrote:<br></p><blockquote =
class=3D=22gmail=5Fquote=22 style=3D=22margin:0 0 0 .8ex;border-left:1px =
#ccc solid;padding-left:1ex;=22><br>Issue #9347 has been reported by =
marcandre (Marc-Andre Lafortune).
<br><br>----------------------------------------
<br>Feature #9347: Accept non callable argument to detect
<br>https://bugs.ruby-lang.org/issues/9347
<br><br>Author: marcandre (Marc-Andre Lafortune)
<br>Status: Open
<br>Priority: Normal
<br>Assignee: matz (Yukihiro Matsumoto)
<br>Category: core
<br>Target version: current: 2.2.0
<br><br><br>Currently, the only argument that `Enumerable#detect` accepts =
is a callable object.
<br><br>Shouldn't we accept non callable objects too=3F
<br><br>    [42].detect(:not=5Ffound){} # =3D&gt; NoMethodError: undefined =
method `call' for :not=5Ffound:Symbol
<br>     # would return :not=5Ffound instead.
<br><br>I'd suggest that if the given argument does not `respond=5Fto=3F =
:call`, then it would be returned as is instead of raising an error as =
currently.
<br>Wouldn't this be more flexible and possibly more performant=3F
<br><br>Inspired by http://stackoverflow.com/questions/20883414/why-does-en=
umerabledetect-need-a-proc-lambda
<br><br><br>--=20
<br>http://bugs.ruby-lang.org/
<br></blockquote></div><br>
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