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require 'active_support/core_ext/object/duplicable'
class Object
# Returns a deep copy of object if it's duplicable. If it's
# not duplicable, returns +self+.
#
# object = Object.new
# dup = object.deep_dup
# dup.instance_variable_set(:@a, 1)
#
# object.instance_variable_defined?(:@a) # => false
# dup.instance_variable_defined?(:@a) # => true
def deep_dup
duplicable? ? dup : self
end
end
class Array
# Returns a deep copy of array.
#
# array = [1, [2, 3]]
# dup = array.deep_dup
# dup[1][2] = 4
#
# array[1][2] # => nil
# dup[1][2] # => 4
def deep_dup
map { |it| it.deep_dup }
end
end
class Hash
# Returns a deep copy of hash.
#
# hash = { a: { b: 'b' } }
# dup = hash.deep_dup
# dup[:a][:c] = 'c'
#
# hash[:a][:c] # => nil
# dup[:a][:c] # => "c"
def deep_dup
each_with_object(dup) do |(key, value), hash|
hash[key.deep_dup] = value.deep_dup
end
end
end
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