Changeset 4599
- Timestamp:
- 07/09/06 20:48:31 (2 years ago)
- Files:
-
- trunk/activesupport/CHANGELOG (modified) (1 diff)
- trunk/activesupport/lib/active_support/core_ext/enumerable.rb (modified) (1 diff)
- trunk/activesupport/test/core_ext/enumerable_test.rb (modified) (1 diff)
Legend:
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- Added
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trunk/activesupport/CHANGELOG
r4555 r4599 1 1 *SVN* 2 3 * Optional identity for Enumerable#sum defaults to zero. #5657 [gensym@mac.com] 2 4 3 5 * HashWithIndifferentAccess shouldn't confuse false and nil. #5601 [shugo@ruby-lang.org] trunk/activesupport/lib/active_support/core_ext/enumerable.rb
r4495 r4599 31 31 # Also calculates sums without the use of a block: 32 32 # [5, 15, 10].sum # => 30 33 def sum(&block) 33 # 34 # The default identity (sum of an empty list) is zero. 35 # However, you can override this default: 36 # 37 # [].sum(Payment.new(0)) { |i| i.amount } # => Payment.new(0) 38 # 39 def sum(identity = 0, &block) 40 return identity unless size > 0 34 41 if block_given? 35 42 map(&block).sum trunk/activesupport/test/core_ext/enumerable_test.rb
r4595 r4599 45 45 assert_equal 60, payments.sum { |p| p.price.to_i * 2 } 46 46 end 47 47 48 def test_empty_sums 49 assert_equal 0, [].sum 50 assert_equal 0, [].sum { |i| i } 51 assert_equal Payment.new(0), [].sum(Payment.new(0)) 52 end 53 48 54 def test_index_by 49 55 payments = [ Payment.new(5), Payment.new(15), Payment.new(10) ]
