DESIGN PATTERNS

"A pattern describes a problem which occurs over and over again in our environment, and then describes the core of the solution to that problem, in such a way that you can use this solution a million times over, without ever doing it the same way twice."

- Christopher Alexander

KOMMUNIKATION

Software Design Patterns are sort of recipes for building maintainable and reusable code.

Before software can be reusable it first has to be usable .

- Ralph Johnson

TIGHT COUPLING

De klassiske

Abstract Factory
Builder
Factory Method
Prototype
Singleton
Adapter
Bridge
Composite
Decorator
Facade
Flyweight
Proxy
Chain of Responsibility
Command
Interpreter
Iterator
Mediator
Memento
Observer
State
Strategy
Template
Visitor

DESIGN PATTERNS CATEGORIZED

Creational
Structural
Behavioural

DESIGN PATTERNS CATEGORIZED

Creational:

Abstract Factory
Builder
Factory Method
Prototype
Singleton

Structural:

Adapter
Bridge
Composite
Decorator
Facade
Flyweight
Proxy

Behavioral:

Chain of Responsibility
Command
Interpreter
Iterator
Mediator
Memento
Observer
State
Strategy
Template
Visitor

bonus:

LIFE CYCLE of a design pattern

Author writes about design pattern in a book.
Book becomes well read, possibly a best-seller.
Design pattern enters public conscious, gains mind share
Design pattern gets used. It works well.
Design pattern gets over-used. It becomes panacea.
Different author writes "design pattern considered harmful"
Design pattern becomes an anti-pattern.
Different author becomes famous, writes book full of new design patterns..