Contents

# Backport from Rails 4.x
# https://github.com/rails/rails/blob/4-0-stable/activesupport/lib/active_support/core_ext/object/deep_dup.rb

require_relative '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(&: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

Version data entries

4 entries across 4 versions & 1 rubygems

Version	Path
grape-0.12.0	lib/backports/active_support/deep_dup.rb
grape-0.11.0	lib/backports/active_support/deep_dup.rb
grape-0.10.1	lib/backports/active_support/deep_dup.rb
grape-0.10.0	lib/backports/active_support/deep_dup.rb