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Returns a string containing the characters in +self+,
each with possibly changed case:
- The first character made uppercase.
- All other characters are made lowercase.
Examples:
'hello'.capitalize # => "Hello"
'HELLO'.capitalize # => "Hello"
'straße'.capitalize # => "Straße" # Lowercase 'ß' not changed.
'STRAẞE'.capitalize # => "Straße" # Uppercase 'ẞ' downcased to 'ß'.
'привет'.capitalize # => "Привет"
'ПРИВЕТ'.capitalize # => "Привет"
Some characters (and some character sets) do not have upcase and downcase versions;
see {Case Mapping}[rdoc-ref:case_mapping.rdoc]:
s = '1, 2, 3, ...'
s.capitalize == s # => true
s = 'こんにちは'
s.capitalize == s # => true
The casing is affected by the given +mapping+,
which may be +:ascii+, +:fold+, or +:turkic+;
see {Case Mappings}[rdoc-ref:case_mapping.rdoc@Case+Mappings].
Related: see {Converting to New String}[rdoc-ref:String@Converting+to+New+String].
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