How can I properly chain custom methods in Ruby?

Question

I am trying to do a chaining method for the following two methods. After running this code, I kept getting the following output:

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Answer 1

Another way is to build pipeline via chainable_methods gem.

Described in the article

require 'chainable_methods'

module SimpleMath
  include ChainableMethods

  def add(a, b=0)
    a + b
  end

  def subtract(a, b=0)
    a - b    
  end
end

SimpleMath.
  chain_from(5).
  add(5).
  add(5).
  subtract(3).
  unwrap