rubyco https://blog.hatena.ne.jp/rubyco/ rubyco（るびこ）の日記 https://rubyco.hatenadiary.org/ 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 = Mar… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Frubyco.hatenadiary.org%2Fentry%2F20060326%2Fmarshal" title="Marshalでdeep copy - rubyco（るびこ）の日記" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2006-03-26 00:00:00 rich https://rubyco.hatenadiary.org/entry/20060326/marshal 1.0 100%