Advanced Rails - Building Industrial-Strength Web Apps in Record Time

String

String | 73

• String#tableize converts class names to table names (as in ActiveRecord).
  String#classify converts table names to class names.
  "ProductCategory".tableize # => "product_categories"
  "product_categories".classify # => "ProductCategory"


• String#constantizetries to interpret the given string as a constant name. This is use-
  ful for looking up classes returned fromString#classify.
  "ProductCategory".constantize rescue "no class" # => "no class"
  class ProductCategory; end
  "ProductCategory".constantize # => ProductCategory

String i18n core_ext/string/unicode.rb,core_ext/string/iterators.rb

These files provide interfaces to ActiveSupport::Multibyte for support for multibyte charac-
ters. These methods depend on the current value of the$KCODEglobal variable, which
determines the character encoding in use.$KCODE can take on the following values.

In Rails 1.2,$KCODE is automatically set tou, enabling the multibyte operations.

• String#charsreturns an instance ofActiveSupport::Multibyte::Chars, which proxies
  for theStringclass.Charsdefines methods that work properly under Unicode (assum-
  ing the proper$KCODE setting), and proxies methods it doesn’t know about toString:
  str =

$KCODE = "a"

str # => "\344\273\212\346\227\245\343\201\257\344\270\226\347\225\214"

str.length # => 15

str.chars.class # => ActiveSupport::Multibyte::Chars

str.chars.length # => 15

$KCODE = "u"

str # =>

str.length # => 15

str.chars.length # => 5

String#each_char yields each character in turn to the block:

$KCODE = "u"

.each_char {|c| puts c}

# >>

# >>

# >>

# >>

# >>

$KCODE Encoding

e,E EUC

s,S Shift-JIS

u,U UTF-8

a,A,n,N ASCII (default)