diff options
Diffstat (limited to 'railties/guides/source/active_support_core_extensions.textile')
-rw-r--r-- | railties/guides/source/active_support_core_extensions.textile | 73 |
1 files changed, 0 insertions, 73 deletions
diff --git a/railties/guides/source/active_support_core_extensions.textile b/railties/guides/source/active_support_core_extensions.textile index ee4565fdfe..25d8f50a7b 100644 --- a/railties/guides/source/active_support_core_extensions.textile +++ b/railties/guides/source/active_support_core_extensions.textile @@ -1838,43 +1838,6 @@ NOTE: Defined in +active_support/core_ext/string/inflections.rb+. h4(#string-conversions). Conversions -h5. +ord+ - -Ruby 1.9 defines +ord+ to be the codepoint of the first character of the receiver. Active Support backports +ord+ for single-byte encodings like ASCII or ISO-8859-1 in Ruby 1.8: - -<ruby> -"a".ord # => 97 -"à".ord # => 224, in ISO-8859-1 -</ruby> - -In Ruby 1.8 +ord+ doesn't work in general in UTF8 strings, use the multibyte support in Active Support for that: - -<ruby> -"a".mb_chars.ord # => 97 -"à".mb_chars.ord # => 224, in UTF8 -</ruby> - -Note that the 224 is different in both examples. In ISO-8859-1 "à" is represented as a single byte, 224. Its single-character representation in UTF8 has two bytes, namely 195 and 160, but its Unicode codepoint is 224. If we call +ord+ on the UTF8 string "à" the return value will be 195 in Ruby 1.8. That is not an error, because UTF8 is unsupported, the call itself would be bogus. - -INFO: +ord+ is equivalent to +getbyte(0)+. - -NOTE: Defined in +active_support/core_ext/string/conversions.rb+. - -h5. +getbyte+ - -Active Support backports +getbyte+ from Ruby 1.9: - -<ruby> -"foo".getbyte(0) # => 102, same as "foo".ord -"foo".getbyte(1) # => 111 -"foo".getbyte(9) # => nil -"foo".getbyte(-1) # => 111 -</ruby> - -INFO: +getbyte+ is equivalent to +[]+. - -NOTE: Defined in +active_support/core_ext/string/conversions.rb+. - h5. +to_date+, +to_time+, +to_datetime+ The methods +to_date+, +to_time+, and +to_datetime+ are basically convenience wrappers around +Date._parse+: @@ -1967,20 +1930,6 @@ h3. Extensions to +BigDecimal+ h3. Extensions to +Enumerable+ -h4. +group_by+ - -Active Support redefines +group_by+ in Ruby 1.8.7 so that it returns an ordered hash as in 1.9: - -<ruby> -entries_by_surname_initial = address_book.group_by do |entry| - entry.surname.at(0).upcase -end -</ruby> - -Distinct block return values are added to the hash as they come, so that's the resulting order. - -NOTE: Defined in +active_support/core_ext/enumerable.rb+. - h4. +sum+ The method +sum+ adds the elements of an enumerable: @@ -2109,20 +2058,6 @@ The methods +second+, +third+, +fourth+, and +fifth+ return the corresponding el NOTE: Defined in +active_support/core_ext/array/access.rb+. -h4. Random Access - -Active Support backports +sample+ from Ruby 1.9: - -<ruby> -shape_type = [Circle, Square, Triangle].sample -# => Square, for example - -shape_types = [Circle, Square, Triangle].sample(2) -# => [Triangle, Circle], for example -</ruby> - -NOTE: Defined in +active_support/core_ext/array/random_access.rb+. - h4. Adding Elements h5. +prepend+ @@ -2875,14 +2810,6 @@ WARNING: The original +Range#include?+ is still the one aliased to +Range#===+. NOTE: Defined in +active_support/core_ext/range/include_range.rb+. -h4. +cover?+ - -Ruby 1.9 provides +cover?+, and Active Support defines it for previous versions as an alias for +include?+. - -The method +include?+ in Ruby 1.9 is different from the one in 1.8 for non-numeric ranges: instead of being based on comparisons between the value and the range's endpoints, it walks the range with +succ+ looking for value. This works better for ranges with holes, but it has different complexity and may not finish in some other cases. - -In Ruby 1.9 the old behavior is still available in the new +cover?+, which Active Support backports for forward compatibility. For example, Rails uses +cover?+ for ranges in +validates_inclusion_of+. - h4. +overlaps?+ The method +Range#overlaps?+ says whether any two given ranges have non-void intersection: |