How to convert a string to lower or upper case in Ruby

Question

How do I take a string and convert it to lower or upper case in Ruby?

Answer 1

Like @endeR mentioned, if internationalization is a concern, the unicode_utils gem is more than adequate.

$ gem install unicode_utils
$ irb
> require 'unicode_utils'
=> true
> UnicodeUtils.downcase("FEN BİLİMLERİ", :tr)
=> "fen bilimleri"

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String manipulations in Ruby 2.4 are now unicode-sensitive.