diff options
Diffstat (limited to 'activesupport/lib/active_support/core_ext/enumerable.rb')
| -rw-r--r-- | activesupport/lib/active_support/core_ext/enumerable.rb | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/activesupport/lib/active_support/core_ext/enumerable.rb b/activesupport/lib/active_support/core_ext/enumerable.rb index b950826396..03efe6a19a 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] }] @@ -63,11 +65,15 @@ class Range #:nodoc: # Optimize range sum to use arithmetic progression if a block is not given and # we have a range of numeric values. def sum(identity = 0) - if block_given? || !(first.instance_of?(Integer) && last.instance_of?(Integer)) + if block_given? || !(first.is_a?(Integer) && last.is_a?(Integer)) super else actual_last = exclude_end? ? (last - 1) : last - (actual_last - first + 1) * (actual_last + first) / 2 + if actual_last >= first + (actual_last - first + 1) * (actual_last + first) / 2 + else + identity + end end end end |