decorator.rb

# Decorating an anonymous function using a block is fairly easy

log_function = lambda do |fn, *args|
  puts "About to call"
  fn.call(*args)
  puts "Did the call"
end

arrow_function = -> (*args) { puts "Being called now with #{args}" }
arrow_function = log_function.curry.(arrow_function)
arrow_function


# To make it work with a normal function, we need to do...

def normal_function(*args)
  puts "Being called now with #{args}"
end

modified_log_function = lambda do |fn_symbol, *args|
  puts "About to call"
  method(fn_symbol).call(*args)
  puts "Did the call"
end

normal_function = modified_log_function.curry.(:normal_function)
normal_function


# This seems like the best way to do decoration.
module Decorator
  def hello(*)
    puts "Doing a thing"
    super
    puts "Done the thing"
  end
end

MyObj = Struct.new(:name) do
  def hello
    puts "My name is #{name}"
  end
end

MyObj.prepend Decorator

MyObj.new("Dara").hello