diff options
Diffstat (limited to 'activesupport')
-rw-r--r-- | activesupport/CHANGELOG.md | 11 | ||||
-rw-r--r-- | activesupport/lib/active_support/core_ext/array.rb | 1 | ||||
-rw-r--r-- | activesupport/lib/active_support/core_ext/array/extract.rb | 21 | ||||
-rw-r--r-- | activesupport/test/core_ext/array/extract_test.rb | 44 |
4 files changed, 77 insertions, 0 deletions
diff --git a/activesupport/CHANGELOG.md b/activesupport/CHANGELOG.md index 25e2ee04f9..4ae02edd6a 100644 --- a/activesupport/CHANGELOG.md +++ b/activesupport/CHANGELOG.md @@ -1,3 +1,14 @@ +* Add `Array#extract!`. + + The method removes and returns the elements for which the block returns a true value. + If no block is given, an Enumerator is returned instead. + + numbers = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] + odd_numbers = numbers.extract! { |number| number.odd? } # => [1, 3, 5, 7, 9] + numbers # => [0, 2, 4, 6, 8] + + *bogdanvlviv* + * Support not to cache `nil` for `ActiveSupport::Cache#fetch`. cache.fetch('bar', skip_nil: true) { nil } diff --git a/activesupport/lib/active_support/core_ext/array.rb b/activesupport/lib/active_support/core_ext/array.rb index 6d83b76882..a2569c798b 100644 --- a/activesupport/lib/active_support/core_ext/array.rb +++ b/activesupport/lib/active_support/core_ext/array.rb @@ -3,6 +3,7 @@ require "active_support/core_ext/array/wrap" require "active_support/core_ext/array/access" require "active_support/core_ext/array/conversions" +require "active_support/core_ext/array/extract" require "active_support/core_ext/array/extract_options" require "active_support/core_ext/array/grouping" require "active_support/core_ext/array/prepend_and_append" diff --git a/activesupport/lib/active_support/core_ext/array/extract.rb b/activesupport/lib/active_support/core_ext/array/extract.rb new file mode 100644 index 0000000000..cc5a8a3f88 --- /dev/null +++ b/activesupport/lib/active_support/core_ext/array/extract.rb @@ -0,0 +1,21 @@ +# frozen_string_literal: true + +class Array + # Removes and returns the elements for which the block returns a true value. + # If no block is given, an Enumerator is returned instead. + # + # numbers = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] + # odd_numbers = numbers.extract! { |number| number.odd? } # => [1, 3, 5, 7, 9] + # numbers # => [0, 2, 4, 6, 8] + def extract! + return to_enum(:extract!) { size } unless block_given? + + extracted_elements = [] + + reject! do |element| + extracted_elements << element if yield(element) + end + + extracted_elements + end +end diff --git a/activesupport/test/core_ext/array/extract_test.rb b/activesupport/test/core_ext/array/extract_test.rb new file mode 100644 index 0000000000..200727667c --- /dev/null +++ b/activesupport/test/core_ext/array/extract_test.rb @@ -0,0 +1,44 @@ +# frozen_string_literal: true + +require "abstract_unit" +require "active_support/core_ext/array" + +class ExtractTest < ActiveSupport::TestCase + def test_extract + numbers = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] + array_id = numbers.object_id + + odd_numbers = numbers.extract!(&:odd?) + + assert_equal [1, 3, 5, 7, 9], odd_numbers + assert_equal [0, 2, 4, 6, 8], numbers + assert_equal array_id, numbers.object_id + end + + def test_extract_without_block + numbers = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] + array_id = numbers.object_id + + extract_enumerator = numbers.extract! + + assert_instance_of Enumerator, extract_enumerator + assert_equal numbers.size, extract_enumerator.size + + odd_numbers = extract_enumerator.each(&:odd?) + + assert_equal [1, 3, 5, 7, 9], odd_numbers + assert_equal [0, 2, 4, 6, 8], numbers + assert_equal array_id, numbers.object_id + end + + def test_extract_on_empty_array + empty_array = [] + array_id = empty_array.object_id + + new_empty_array = empty_array.extract! {} + + assert_equal [], new_empty_array + assert_equal [], empty_array + assert_equal array_id, empty_array.object_id + end +end |