Make chained call possible when creating a block using `&`

cahined.rb

class Chained
  class DSL
    undef_method *(Class.new.instance_methods - %i( __send__ __id__ object_id ))

    def initialize
      @chain = []
    end

    def method_missing(name, *args, &block)
      @chain << [name, args, block]
      self
    end

    def to_proc
      Proc.new do |val|
        @chain.each do |method_name, args, block|
          val = val.send method_name, *args, &block
        end

        val
      end
    end
  end

  def self.begin
    DSL.new
  end
end

def chained
  Chained.begin
end

example.rb

[[1, 2, 3], [4, 5, 6]].map &chained.map(&:to_f).join('::')
# => ["1.0::2.0::3.0", "4.0::5.0::6.0"]