From: "alexeymuranov (Alexey Muranov)" <redmine@...>
Date: 2012-04-13T14:48:38+09:00
Subject: [ruby-core:44326] [ruby-trunk - Feature #6225] Hash#+


Issue #6225 has been updated by alexeymuranov (Alexey Muranov).


I would like to give an algebraic counterpart to Matz's objection: `merge` is not injective in second argument: a.merge(b) == a.merge(c) does not imply b == c, but most uses of `+` are injective in each of the arguments.

However, `Set#+` is an exception to this rule, it seems that it is equivalent to `Set#|`, isn't it?
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Feature #6225: Hash#+
https://bugs.ruby-lang.org/issues/6225#change-25873

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


Strings and Arrays can be combined with #+. I don't see any reason not to allow Hashes to do so as well.

  class Hash
    alias :+ :merge
  end



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