equivalent to elixer pipe in ruby

insert_args.rb

class Proc
  def <<(*args)
    args = args.flatten if args.count == 1
    -> (*items) { self.call(*items, *args) }
  end
end

adder = -> (*args) { args.inject(&:+) }

puts [1,2,3,4,5]
  .map(&adder << 1)
  .map(&adder << [10, 100]).inspect

class Method
  def <<(*args)
    args = args.flatten if args.count == 1
    -> (*items) { self.call(*items, *args) }
  end
end

class Mathx
  def self.product(*args)
    args.inject(&:*)
  end

  def self.division(*args)
    args.inject(&:/)
  end
end

puts [1,2,3,4,5]
  .map(&Mathx.method(:product) << 4)
  .map(&Mathx.method(:division) << 2).inspect