1 files changed, 8 insertions, 0 deletions
diff --git a/lib/bacon.rb b/lib/bacon.rb
index 48b76b2..dfc45e2 100644
--- a/lib/bacon.rb
+++ b/lib/bacon.rb
@@ -165,6 +165,7 @@ module Bacon
 
     def raise?(*args, &block); block.raise?(*args); end
     def throw?(*args, &block); block.throw?(*args); end
+    def change?(*args, &block); block.change?(*args); end
   end
 end
 
@@ -206,6 +207,13 @@ class Proc
     }
     return true
   end
+
+  def change?
+    pre_result = yield
+    called = call
+    post_result = yield
+    pre_result != post_result
+  end
 end
 
 class Numeric