[ruby-core:47093] Re: [ruby-trunk - Feature #6847][Open] Hash#extract

Isn't that like the method slice in ActiveSupport?

On Thu, Aug 9, 2012 at 1:01 PM, citizen428 (Michael Kohl) <
[e-mail]> 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/
>
>


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