1 files changed, 23 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/hash/transform_values.rb b/activesupport/lib/active_support/core_ext/hash/transform_values.rb
new file mode 100644
index 0000000000..e9bcce761f
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/hash/transform_values.rb
@@ -0,0 +1,23 @@
+class Hash
+  # Returns a new hash with the results of running +block+ once for every value.
+  # The keys are unchanged.
+  #
+  #   { a: 1, b: 2, c: 3 }.transform_values { |x| x * 2 }
+  #   # => { a: 2, b: 4, c: 6 }
+  def transform_values
+    return enum_for(:transform_values) unless block_given?
+    result = self.class.new
+    each do |key, value|
+      result[key] = yield(value)
+    end
+    result
+  end
+
+  # Destructive +transform_values+
+  def transform_values!
+    return enum_for(:transform_values!) unless block_given?
+    each do |key, value|
+      self[key] = yield(value)
+    end
+  end
+end