From: Thomas Sawyer <transfire@...>
Date: 2012-03-17T10:08:42+09:00
Subject: [ruby-core:43364] [ruby-trunk - Feature #5008] Equal rights for Hash (like Array, String, Integer, Float)


Issue #5008 has been updated by Thomas Sawyer.


> "Repeating myself, unlike other classes in the table, Hash does not have "natural" conversion from set of values, so that I don't think it's worth provide to_h method." 

> What does that even mean?

I see, you were referring to Enumerable#to_h and meant there is no "single definitive" method to conversion. True, and to that end, I, with the help of other developers, worked through the general permutations of these:

  https://github.com/rubyworks/facets/blob/master/lib/core/facets/to_hash.rb

So leave Enumerable#to_h out if you don't like it, but #to_h still has a clear definition for a number of other classes, does it not?

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Feature #5008: Equal rights for Hash (like Array, String, Integer, Float)
https://bugs.ruby-lang.org/issues/5008#change-24669

Author: Suraj Kurapati
Status: Assigned
Priority: Normal
Assignee: Yukihiro Matsumoto
Category: 
Target version: 


=begin
Hello,

I am using ruby 1.9.2p180 (2011-02-18 revision 30909) [x86_64-linux].

Although Ruby has a rich set of primitive data types and structures, 
the Hash seems neglected in the Ruby API in comparison to its peers:

* String: Object#to_s by API
* Integer: Kernel#Integer by API and Object#to_i by convention
* Float: Kernel#Float by API and Object#to_f by convention
* Array: Kernel#Array by API and Object#to_a by convention
* Hash: Kernel#Hash (issue #3131) and Object#to_hash by convention

In particular, the Hash seems neglected by the Ruby API because:

* Its convention method (#to_hash) is longer than one character (#to_h).
* It did not have a Kernel-level method until recently (see issue #3131).
* It has no methods for conversion from NilClass, unlike #to_s, a, i, f.

Please rectify this un-orthogonality and grant Hash equal rights by:

* Establish #to_h as the convention method for converting objects into Hash.
* Add Kernel#Hash method for converting objects into Hash strictly (see issue #3131).
* Define NilClass#to_h so that we can convert nil into an empty Hash.

Thanks for your consideration.
=end


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