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| author | Nicholas Seckar <nseckar@gmail.com> | 2006-06-24 16:42:48 +0000 |
|---|---|---|
| committer | Nicholas Seckar <nseckar@gmail.com> | 2006-06-24 16:42:48 +0000 |
| commit | a55265132b37c6fb8ac15a96b44e64a64bcd4c45 (patch) | |
| tree | 28cec2311c882ca64566edae6484950b664d03ad /activesupport/lib | |
| parent | 84d9a292fecc922d4e2cf7b3992e91a182f28b46 (diff) | |
| download | rails-a55265132b37c6fb8ac15a96b44e64a64bcd4c45.tar.gz rails-a55265132b37c6fb8ac15a96b44e64a64bcd4c45.tar.bz2 rails-a55265132b37c6fb8ac15a96b44e64a64bcd4c45.zip | |
Add Enumerable#index_by
git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4491 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
Diffstat (limited to 'activesupport/lib')
| -rw-r--r-- | activesupport/lib/active_support/core_ext/enumerable.rb | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/enumerable.rb b/activesupport/lib/active_support/core_ext/enumerable.rb index 41ccc62afb..0d7d0159f9 100644 --- a/activesupport/lib/active_support/core_ext/enumerable.rb +++ b/activesupport/lib/active_support/core_ext/enumerable.rb @@ -30,4 +30,19 @@ module Enumerable #:nodoc: def sum inject(0) { |sum, element| sum + yield(element) } end + + # Convert an enumerable to a hash. Examples: + # + # people.index_by(&:login) + # => { "nextangle" => <Person ...>, "chade-" => <Person ...>, ...} + # people.index_by { |person| "#{person.first_name} #{person.last_name}" } + # => { "Chade- Fowlersburg-e" => <Person ...>, "David Heinemeier Hansson" => <Person ...>, ...} + # + def index_by + inject({}) do |accum, elem| + accum[yield(elem)] = elem + accum + end + end + end
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