From: davispuh@...
Date: 2014-07-02T01:15:06+00:00
Subject: [ruby-core:63481] [ruby-trunk - Feature #10002] String swapcase

Issue #10002 has been updated by D��vis Mos��ns.


It have been already figured out by [Unicode Standard](http://www.unicode.org/versions/Unicode6.3.0/), so just have to implement it. Look at Default Case Algorithms in section 3.13 and Case Mappings in section 5.18. Mappings can be viewed in [SpecialCasing.txt](http://www.unicode.org/Public/UNIDATA/SpecialCasing.txt) (and [UnicodeData.txt](http://www.unicode.org/Public/UNIDATA/UnicodeData.txt)) also [CaseFolding.txt](http://www.unicode.org/Public/UNIDATA/CaseFolding.txt) could be useful.

From there "��" (LATIN SMALL LETTER SHARP S) in uppercase would be "SS" (LATIN CAPITAL LETTER S) and it's user's responsibility to know that generally they are not reversible.

Also useful to read [Character Properties, Case Mappings & Names FAQ](http://www.unicode.org/faq/casemap_charprop.html)

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Feature #10002: String swapcase
https://bugs.ruby-lang.org/issues/10002#change-47524

* Author: Andreas Runk
* Status: Open
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
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Hi, the ruby version 2.1.2 has a problem with the .swapcase function and german letters. 
E.g. `"��".swapcase` does return "��" but should be "��". 



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