Marshalでdeep copy - rubyco（るびこ）の日記

Object#dupはshallow copyですけれど、Marshal.dumpとMarshal.loadでdeep copyになります。 a = ["A", ["B", "C"]] # dup - shallow copy b = a.dup p a == b #=> true p a.object_id == b.object_id #=> false p a[0].object_id == b[0].object_id #=> true p a[1].object_id == b[1].object_id #=> true # dump+load - deep copy c = Marshal.load(Marshal.dump(a)) p a == c #=> true p a.object_id == c.object_id #=> false p a[0].object_id