From: "trans (Thomas Sawyer)" <transfire@...>
Date: 2012-05-17T00:34:34+09:00
Subject: [ruby-core:45090] [ruby-trunk - Feature #6277] Hash#convert_key


Issue #6277 has been updated by trans (Thomas Sawyer).


I am going to create a separate issue fro the CRUDify of Hash. After working on the Hashery (http://github.com/rubyworks/hashery) project all this week, it is clear to me that both a key casting proc and a CRUDified Hash class are independently useful.
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Feature #6277: Hash#convert_key
https://bugs.ruby-lang.org/issues/6277#change-26663

Author: trans (Thomas Sawyer)
Status: Assigned
Priority: Normal
Assignee: matz (Yukihiro Matsumoto)
Category: core
Target version: 2.0.0


=begin
Many times a hash with uniform keys is needed (or is at least preferable) for a particular usecase. To this end I propose ((%Hash#convert_key%)).

  h = {}
  h.convert_key{ |k| k.to_sym }
  h['a'] = 1
  h.update('b'=>2)
  h #=> {:a=>1, :b=>2}

The idea is similar in concept to ((%#default_proc%)). 

Others solutions to fill this need have been tried and used, but almost exclusively are in the form of a new class. Most notable is Rails HashWithIndifferentAccess. But ((%#convert_key%)) has much greater flexibility since keys can be converted to anything.
=end


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