Ruby metaprogramming list of spells (ie design patterns)

ruby-metaprogramming

Argument Array 
Collapse a list of arguments into an array.

Around Alias
Call the previous, aliased version of a method from a redefined method.

Blank Slate
Remove methods from an object to turn them into Ghost Methods.

Class Extension
Define class methods by mixing a module into a class's eigenclass.

Class Extension Mixin
Enable a module to extend is include through a Hook Method.

Class Instance Variable
Store class-level state in an instance variable of the Class object.

Class Macro
Use a class method in a class definition.

Clean Room
Use an object as an environment in which to evaluate a block.

Code Processor
Process a String of Code from an external source.

Context Probe
Execute a block to access information in an object's context.

Deferred Evaluation
Fore a piece of code and its context in a proc or lambda for evaluation later.

Dynamic Dispatch
Decide which method to call at runtime.

Dynamic Method
Decide how to define a method at runtime.

Dynamic Proxy
Forwad to another object any messages that don't match a method.

Flat Scope
Use a closure to share variable between two scopes.

Ghost Method
Respond to a message that doesn't have an associated method.

Hook Method
Override a method to intercept object model events.

Kernal Method
Define a method in module Kernal to make the method available to all objects.

Lazy Instance Variable
Wait until the first access to initialize an instance variable.

Mimic Method
Disguise a method as another language contruct.

Monkey patch
Change the features of an existing class.

Named Arguments
Collect method arguments into a hash to identify them by name.

Namespace
Define constants within a module to avoid name clashes.

Nil Guard
Override a reference to nil with an ||

Object Extension
Define Singleton Methods by mixing a module into an object's eigenclass.

Open Class
Modify an existing class.

Pattern Dispatch
Select which methods to call based on their names.

Sandbox
Execute untrusted code in a safe environment.

Scope Gate
Isolate a scope with the class, module, or def keyword.

Shared Scope
Share variables among multiple contexts in the same Flat Scope.

Singleton Method
Define a method on a single object

String of Code
Evaluate a string of Ruby code.

Symbol to Proc
Convert a symbo to a block that calls a single method.