diff options
Diffstat (limited to 'activesupport/lib/active_support/core_ext/enumerable.rb')
| -rw-r--r-- | activesupport/lib/active_support/core_ext/enumerable.rb | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/enumerable.rb b/activesupport/lib/active_support/core_ext/enumerable.rb index b950826396..02d5a7080f 100644 --- a/activesupport/lib/active_support/core_ext/enumerable.rb +++ b/activesupport/lib/active_support/core_ext/enumerable.rb @@ -17,6 +17,7 @@ module Enumerable # The default sum of an empty list is zero. You can override this default: # # [].sum(Payment.new(0)) { |i| i.amount } # => Payment.new(0) + # def sum(identity = 0, &block) if block_given? map(&block).sum(identity) @@ -31,6 +32,7 @@ module Enumerable # => { "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 if block_given? Hash[map { |elem| [yield(elem), elem] }] |