Nate Hopkins hopsoft

## application_helper.rb
# app/helpers/application_helper.rb
module ApplicationHelper

  def javascript_modules_tag
    paths = Dir[
      Rails.root.join("app/assets/javascripts/modules/**/*"),
      Rails.root.join("lib/assets/javascripts/modules/**/*"),
      Rails.root.join("vendor/assets/javascripts/modules/**/*")
    ]

## application.html.erb
<!DOCTYPE html>
<html>
<head>
  <title>Example</title>
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <%= stylesheet_link_tag 'application', media: 'all' %>
  <%= csrf_meta_tags %>
</head>
<body>
  <%= yield %>

## main.js
// app/assets/javascripts/main.js
require([modules.lodash,], function (_) {
  console.log(_);
});

## example.js
// app/assets/javascripts/modules/example.js
define([modules.lodash], function (_) {
  return "This is an example.";
});

## application.js
// app/assets/javascripts/application.js
//= require jquery
//= require jquery-ujs
//= require main

## monkeypatch.rb
# define original class
class Example

  def say_hello
    puts "hello"
  end

end

# re-open the class and monkeypatch some of its existing functionality

## open_classes.rb
# define original class
class Example

  def say_hello
    puts "hello"
  end

end

# re-open the class

## namespace.rb
# create a namespace to avoid naming collisions
module Example

  class String
    def length
      100
    end
  end

end

## kernel_method.rb
# add a kernel method to make it available to all objects
# this example also serves to illustrate that everything in Ruby is an object
module Kernel

  def say_hello
    puts "hello from #{self.class.name}"
  end

end

## dynamic_dispatch.rb
# add methods that provide the ability
# to dynamically call unknown methods on objects
def invoke(object, method_name)
  object.send(method_name)
end

def invoke_with_args(object, method_name, *args)
  object.send(method_name, *args)
end
	# app/helpers/application_helper.rb
	module ApplicationHelper

	def javascript_modules_tag
	paths = Dir[
	Rails.root.join("app/assets/javascripts/modules/*/"),
	Rails.root.join("lib/assets/javascripts/modules/*/"),
	Rails.root.join("vendor/assets/javascripts/modules/*/")
	]
	<!DOCTYPE html>
	<html>
	<head>
	<title>Example</title>
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<%= stylesheet_link_tag 'application', media: 'all' %>
	<%= csrf_meta_tags %>
	</head>
	<body>
	<%= yield %>
	// app/assets/javascripts/main.js
	require([modules.lodash,], function (_) {
	console.log(_);
	});
	// app/assets/javascripts/modules/example.js
	define([modules.lodash], function (_) {
	return "This is an example.";
	});
	// app/assets/javascripts/application.js
	//= require jquery
	//= require jquery-ujs
	//= require main
	# define original class
	class Example

	def say_hello
	puts "hello"
	end

	end

	# re-open the class and monkeypatch some of its existing functionality
	# create a namespace to avoid naming collisions
	module Example

	class String
	def length
	100
	end
	end

	end
	# add a kernel method to make it available to all objects
	# this example also serves to illustrate that everything in Ruby is an object
	module Kernel

	def say_hello
	puts "hello from #{self.class.name}"
	end

	end
	# add methods that provide the ability
	# to dynamically call unknown methods on objects
	def invoke(object, method_name)
	object.send(method_name)
	end

	def invoke_with_args(object, method_name, *args)
	object.send(method_name, *args)
	end