Design Patterns

"A design pattern systematically names, explains and evaluates an important reoccurring design in object-oriented systems." (Design Patterns)

Four essential elements of a pattern

1. Pattern Name
2. The Problem
3. The Solution
4. The Consequences

General Pattern Categories

1. Creational Patterns - object creation methods
   
2. Structural Patterns - structuring, grouping and usage of classes
   
3. Behavioral Patterns - techniques of object interaction