Design

• Composition over Inheritance

The preference to compose behaviour from object rather inherit behaviour from objects.

• Immutability

State cannot be modified once it has been created.

• Law of Demeter

An implementation of loose coupling.

• Nulls & Null Objects

Excessive null checking can be alleviated by the use of the Null Object Pattern.

• Open/Closed Principle

Open for extension, closed for change.

• Single Responsibility Principle

A class or method should only have a single reason to change.

• Small

Keeping objects small makes them easier to understand.

• Tiny Types

Tiny or Micro types wrap primitive types in a class to provide stronger typing and cohesive functionality.