Document Hash#extract!.

1 files changed, 2 insertions, 0 deletions

diff --git a/activesupport/lib/active_support/core_ext/hash/slice.rb b/activesupport/lib/active_support/core_ext/hash/slice.rb
index d7fb2da0fb..0484d8e5d8 100644
--- a/activesupport/lib/active_support/core_ext/hash/slice.rb
+++ b/activesupport/lib/active_support/core_ext/hash/slice.rb
@@ -30,6 +30,8 @@ class Hash
     omit
   end
 
+  # Removes and returns the key/value pairs matching the given keys.
+  #   {:a => 1, :b => 2, :c => 3, :d => 4}.extract!(:a, :b) # => {:a => 1, :b => 2}
   def extract!(*keys)
     result = {}
     keys.each {|key| result[key] = delete(key) }