Module: Corefines::Object::DeepDup

Defined in:
lib/corefines/object.rb

Instance Method Summary collapse

Instance Method Details

#deep_dup ⇒ Object

Returns a deep copy of itself.

If self is an instance of Array, Set or Hash, then it recursively copies its elements as well. If a nested object responds to deep_dup (note: respond_to? doesn't see refined methods), then it use it.

Returns:

  • (Object) —

    a copy of self, or self if it's not duplicable.



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# File 'lib/corefines/object.rb', line 104

module DeepDup
  refine ::Object do
    # NOTE: Refinement is not active inside itself, so we can't simply call
    # deep_dup on a nested object like ActiveSupport does. Thus we must use
    # this ugly approach instead...
    def deep_dup(obj = self)
      return obj.deep_dup if obj != self && obj.respond_to?(:deep_dup)

      case obj
      when ::NilClass, ::FalseClass, ::TrueClass, ::Symbol, ::Numeric, ::Method
        obj  # not duplicable
      when ::Array
        obj.map { |o| deep_dup(o) }
      when ::Set
        ::Set[obj.map { |o| deep_dup(o) }]
      when ::Hash
        obj.each_with_object({}) { |(k, v), h| h[deep_dup(k)] = deep_dup(v) }
      else
        begin
          obj.dup
        rescue TypeError, NoMethodError
          obj
        end
      end
    end
  end
end