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Added Enumerable#first_match

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@2578 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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1 parent 276f144 commit e9df41a75929ad72608eb9a2d3757b200ba1d23d @seckar seckar committed Oct 14, 2005
@@ -1,5 +1,7 @@
*SVN*
+* Added Enumerable#first_match [Nicholas Seckar]
+
* Fixed that Time#change should also reset usec when also resetting minutes #2459 [ikeda@dream.big.or.jp]
* Fix Logger compatibility for distributions that don't keep Ruby and its standard library in sync.
@@ -0,0 +1,9 @@
+module Enumerable
+ def first_match
+ match = nil
+ each do |items|
+ break if match = yield(items)
+ end
+ match
+ end
+end
@@ -0,0 +1,15 @@
+require 'test/unit'
+require File.dirname(__FILE__) + '/../../lib/active_support/core_ext/enumerable'
+
+class EnumerableTests < Test::Unit::TestCase
+
+ def test_first_match_no_match
+ [[1, 2, 3, 4, 5], (1..9)].each {|a| a.first_match {|x| x > 10}}
+ end
+
+ def test_first_match_with_match
+ assert_equal true, [1, 2, 3, 4, 5, 6].first_match {|x| x > 4}
+ assert_equal true, (1..10).first_match {|x| x > 9}
+ assert_equal :aba, {:a => 10, :aba => 50, :bac => 40}.first_match {|k, v| k if v > 45}
+ end
+end

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