From: Clay Trump <clay.trump@...>
Date: 2012-08-10T02:29:58+09:00
Subject: [ruby-core:47093] Re: [ruby-trunk - Feature #6847][Open] Hash#extract

--14dae9340fc782347c04c6d89313
Content-Type: text/plain; charset=ISO-8859-1

Isn't that like the method slice in ActiveSupport?

On Thu, Aug 9, 2012 at 1:01 PM, citizen428 (Michael Kohl) <
citizen428@gmail.com> wrote:

>
> Issue #6847 has been reported by citizen428 (Michael Kohl).
>
> ----------------------------------------
> Feature #6847: Hash#extract
> https://bugs.ruby-lang.org/issues/6847
>
> Author: citizen428 (Michael Kohl)
> Status: Open
> Priority: Normal
> Assignee:
> Category: core
> Target version:
>
>
> I often need a method to extract "subhashes" from hashes. I often
> monkey-patched this into hash and found "extract" to be a good name for the
> method. Afterwards I found out that there actually is a mutating method
> called "extract!" in ActiveSupport, so I guess the name is kinda
> established. Here's the Ruby version from my private extension library, if
> there's any interest in this I would try to re-implement it in C:
>
> class Hash
>   def extract(*ks)
>     existing = keys & ks
>     Hash[existing.zip(values_at(*existing))]
>   end
> end
>
>
> --
> http://bugs.ruby-lang.org/
>
>


-- 
<lay trum/>

--14dae9340fc782347c04c6d89313
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

Isn&#39;t that like the method slice in ActiveSupport?<br><br><div class=3D=
"gmail_quote">On Thu, Aug 9, 2012 at 1:01 PM, citizen428 (Michael Kohl) <sp=
an dir=3D"ltr">&lt;<a href=3D"mailto:citizen428@gmail.com" target=3D"_blank=
">citizen428@gmail.com</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><br>
Issue #6847 has been reported by citizen428 (Michael Kohl).<br>
<br>
----------------------------------------<br>
Feature #6847: Hash#extract<br>
<a href=3D"https://bugs.ruby-lang.org/issues/6847" target=3D"_blank">https:=
//bugs.ruby-lang.org/issues/6847</a><br>
<br>
Author: citizen428 (Michael Kohl)<br>
Status: Open<br>
Priority: Normal<br>
Assignee:<br>
Category: core<br>
Target version:<br>
<br>
<br>
I often need a method to extract &quot;subhashes&quot; from hashes. I often=
 monkey-patched this into hash and found &quot;extract&quot; to be a good n=
ame for the method. Afterwards I found out that there actually is a mutatin=
g method called &quot;extract!&quot; in ActiveSupport, so I guess the name =
is kinda established. Here&#39;s the Ruby version from my private extension=
 library, if there&#39;s any interest in this I would try to re-implement i=
t in C:<br>

<br>
class Hash<br>
=A0 def extract(*ks)<br>
=A0 =A0 existing =3D keys &amp; ks<br>
=A0 =A0 Hash[existing.zip(values_at(*existing))]<br>
=A0 end<br>
end<br>
<span class=3D"HOEnZb"><font color=3D"#888888"><br>
<br>
--<br>
<a href=3D"http://bugs.ruby-lang.org/" target=3D"_blank">http://bugs.ruby-l=
ang.org/</a><br>
<br>
</font></span></blockquote></div><br><br clear=3D"all"><br>-- <br>&lt;lay t=
rum/&gt;<br><br>

--14dae9340fc782347c04c6d89313--