devise

Mail::Multibyte.mb_chars

== Multibyte proxy

+mb_chars+ is a multibyte safe proxy for string methods.

In Ruby 1.8 and older it creates and returns an instance of the Mail::Multibyte::Chars class which
encapsulates the original string. A Unicode safe version of all the String methods are defined on this proxy
class. If the proxy class doesn't respond to a certain method, it's forwarded to the encapsuled string.

  name = 'Claus Müller'
  name.reverse # => "rell??M sualC"
  name.length  # => 13

  name.mb_chars.reverse.to_s # => "rellüM sualC"
  name.mb_chars.length       # => 12

In Ruby 1.9 and newer +mb_chars+ returns +self+ because String is (mostly) encoding aware. This means that
it becomes easy to run one version of your code on multiple Ruby versions.

== Method chaining

All the methods on the Chars proxy which normally return a string will return a Chars object. This allows
method chaining on the result of any of these methods.

  name.mb_chars.reverse.length # => 12

== Interoperability and configuration

The Chars object tries to be as interchangeable with String objects as possible: sorting and comparing between
String and Char work like expected. The bang! methods change the internal string representation in the Chars
object. Interoperability problems can be resolved easily with a +to_s+ call.

For more information about the methods defined on the Chars proxy see Mail::Multibyte::Chars. For
information about how to change the default Multibyte behaviour see Mail::Multibyte.

Source | Google | Stack overflow