sidekiq worker with arbitrary callback functions

worker.rb

# references:
# https://github.com/mperham/sidekiq (sidekiq)
# https://ruby-doc.org/core-2.3.1/Object.html#method-i-send (ruby's `send` method)
# https://robots.thoughtbot.com/ruby-2-keyword-arguments (ruby keywork arguments in general)
# https://github.com/mperham/sidekiq/issues/2372 (keyword arguments in sidekiq)
# https://github.com/mperham/sidekiq/wiki/Best-Practices (sidekiq best practices)

class Worker
  include Sidekiq::Worker
  def perform(callback=nil)
    send *callback unless callback.nil?
  end
end

Worker.perform_async(['puts', 'cat']) # outputs "cat"

will add an in use example soon!