Different ways to copy object in Ruby

copy_object.rb

h = {}
h[:label] = "Red"

h_copy = h
h_dup = h.dup
h_clone = h.clone
h_deep_copy = Marshal.load( Marshal.dump h )

p h[:label].object_id           # => 2156268500
p h_dup[:label].object_id       # => 2156268500
p h_clone[:label].object_id     # => 2156268500
p h_copy[:label].object_id      # => 2156268500
p h_deep_copy[:label].object_id # => 2156268340