ruby hash without method

hash_without.rb

# source: https://apidock.com/ruby/Hash/delete
class Hash
  def without(*keys)
    cpy = self.dup
    keys.each { |key| cpy.delete(key) }
    cpy
  end
end

h = { :a => 1, :b => 2, :c => 3 }
h.without(:a)      #=> { :b => 2, :c => 3 }
h.without(:a, :c)  #=> { :b => 2 }


class Hash
  def without(*keys)
    dup.without!(*keys)
  end

  def without!(*keys)
    reject! { |key| keys.include?(key) }
  end
end

h = { :a => 1, :b => 2, :c => 3 }
h.without(:a)      #=> { :b => 2, :c => 3 }
h #=> { :a => 1, :b => 2, :c => 3 }  

h.without(:a, :c)  #=> { :b => 2 }

h.without!(:a, :c) # { :b => 2 }
h #=> { :b => 2 }