Try Chain

try_chain.rb

require 'active_support/core_ext/object/try'

module TryChain

  def try_chain
    @proxy = Proxy.new(self)
  end


  class Proxy
    def initialize(obj)
      @base  = obj
      @chain = []
    end


    def execute
      @chain.reduce(@base) do |memo, data|
        memo.try data[0], *data[1]
      end
    end


    def respond_to?(meth, include_all = false)
      false
    end


    def to_s
      method_missing :to_s
    end


    def try_chain
      self
    end


    private

    def method_missing(meth, *args)
      add_to_chain(meth, args)
      self
    end


    def add_to_chain(meth, args)
      @chain << [meth, args]
    end
  end

end

Object.send :include, TryChain

=begin

('a'..'f').try_chain.to_a.shuffle.reverse[2,3].join('-')
# => #<TryChain::Proxy:0x007f935a8dad20
#  @base="a".."f",
#  @chain=[[:to_a, []], [:shuffle, []], [:reverse, []], [:[], [2, 3]], [:join, ["-"]]]>

('a'..'f').try_chain.to_a.shuffle.reverse[2,3].join('-').execute
# => "c-b-a"

=end