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    <p>I was wondering the same thing, so I benchmarked a few different techniques against each other. I was primarily concerned with Arrays and Hashes - I didn't test any complex objects. Perhaps unsurprisingly, a custom deep-clone implementation proved to be the fastest. If you are looking for quick and easy implementation, Marshal appears to be the way to go. </p> <p>I also benchmarked an XML solution with Rails 3.0.7, not shown below. It was much, much slower, ~10 seconds for only 1000 iterations (the solutions below all ran 10,000 times for the benchmark).</p> <p>Two notes regarding my JSON solution. First, I used the C variant, version 1.4.3. Second, it doesn't actually work 100%, as symbols will be converted to Strings. </p> <p>This was all run with ruby 1.9.2p180.</p> <pre><code>#!/usr/bin/env ruby require 'benchmark' require 'yaml' require 'json/ext' require 'msgpack' def dc1(value) Marshal.load(Marshal.dump(value)) end def dc2(value) YAML.load(YAML.dump(value)) end def dc3(value) JSON.load(JSON.dump(value)) end def dc4(value) if value.is_a?(Hash) result = value.clone value.each{|k, v| result[k] = dc4(v)} result elsif value.is_a?(Array) result = value.clone result.clear value.each{|v| result &lt;&lt; dc4(v)} result else value end end def dc5(value) MessagePack.unpack(value.to_msgpack) end value = {'a' =&gt; {:x =&gt; [1, [nil, 'b'], {'a' =&gt; 1}]}, 'b' =&gt; ['z']} Benchmark.bm do |x| iterations = 10000 x.report {iterations.times {dc1(value)}} x.report {iterations.times {dc2(value)}} x.report {iterations.times {dc3(value)}} x.report {iterations.times {dc4(value)}} x.report {iterations.times {dc5(value)}} end </code></pre> <p>results in:</p> <pre><code>user system total real 0.230000 0.000000 0.230000 ( 0.239257) (Marshal) 3.240000 0.030000 3.270000 ( 3.262255) (YAML) 0.590000 0.010000 0.600000 ( 0.601693) (JSON) 0.060000 0.000000 0.060000 ( 0.067661) (Custom) 0.090000 0.010000 0.100000 ( 0.097705) (MessagePack) </code></pre>
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    1. POWhat's the most efficient way to deep copy an object in Ruby?
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    1. PTAnswer
    1. USEvan Pon
    1. USEvan Pon
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    1. POWhat's the most efficient way to deep copy an object in Ruby?
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    1. COThanks, Evan! Good stuff, I appreciate the benchmarks. :)
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      1. USmway
    2. COHey @Evan Pon, I added [MessagePack](http://msgpack.org/) in your examples. It is a good option.
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      1. USPablo Cantero
    3. COMessagePack looks really fast (2 times faster than Custom at my machine). Could you update answer with recommendation to use it instead of Marshal?
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      1. USAndrei Botalov
 

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