Metaprogramming Ruby 101502551 資工 3B 蔣彥亭

Monkey Patch

Open Classes

Class, Module, Object

Class

Class, Superclass

Class Wrap-Up

Methods Call"one step to the right, then up."

How about module?

Method Execution

• Receiver

Self

Private in Ruby

Methods

A Duplication Problem

Solutions

1. Dynamic Methods2. Ghost Methods

Call Methods Dynamically

Define Methods Dynamically

Then...Refactor

method_missing()

Overriding method_missing()

Then... Refactor

Closures

Scope Gates

• When does the scope change?

1. Class definitions

2. Module definitions

3. Methods

Scope Gates (cont.)

Flattening the Scope

Flattening the Scope (Sol)

Flattening the Scope (Sol2)

instance_eval()

Clean Rooms

Class Definitions

Current Object & Current Class

• Current Object• self

• Current Class

class_eval()

Class Instance Variables

Class Variables

Singleton Methods

Class Methods, The Truth

Class Macros

Where is the Singleton Method?

Eigenclasses

Eigenclasses and instance_eval()

Eigenclasses and Inheritance

Eigenclasses Wrap-Up

Quiz: Module Trouble

Quiz Solution

Object#extend

Object#extend() is simply a shortcut that includes a module in the receiver’s eigenclass.

Method Aliases

Around Aliases

That's all. Have fun with Ruby Meta!

Reference

• Metaprogramming Ruby: Program Like the Ruby

Pros ( ISBN-13: 978-1934356470 )