1 files changed, 16 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/object/tap.rb b/activesupport/lib/active_support/core_ext/object/tap.rb
new file mode 100644
index 0000000000..db7e715e2d
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/object/tap.rb
@@ -0,0 +1,16 @@
+class Object
+  # Yields <code>x</code> to the block, and then returns <code>x</code>.
+  # The primary purpose of this method is to "tap into" a method chain,
+  # in order to perform operations on intermediate results within the chain.
+  #
+  #   (1..10).tap { |x| puts "original: #{x.inspect}" }.to_a.
+  #     tap    { |x| puts "array: #{x.inspect}" }.
+  #     select { |x| x%2 == 0 }.
+  #     tap    { |x| puts "evens: #{x.inspect}" }.
+  #     map    { |x| x*x }.
+  #     tap    { |x| puts "squares: #{x.inspect}" }
+  def tap
+    yield self
+    self
+  end unless Object.respond_to?(:tap)
+end