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Design patterns implemented in Scala

Inspired by Design patterns implemented in Java

Introduction

Design patterns are formalized best practices that the programmer can use to solve common problems when designing an application or system. The classical design patterns are the 23 design patterns by GoF.

This project implements dozens of design patterns in Scala. The Scala language has several advanced features which make the implementations are different from other programming languages.

Design patterns are categorized into:

  1. Creational
  2. Structural
  3. Behavioral
  4. Other
  5. Persistence

For each design pattern, it tags:

  1. scala features indicates if the implementation uses scala language-specific features.
  2. functional indicates if the design pattern can be implemented in functional-programming style.
  3. Gang of four indicates if the design pattern is one of the classical 23 design patterns by GoF

Creational

Name scala features functional Gang of four
abstract factory no no yes
builder no no yes
cake yes(trait mix-in) no no
factory kit no yes no
factory method no no yes
prototype no no yes
simple factory yes(companion object) no no
singleton yes(object) no yes
value object yes(case class) no no

Structural

Name scala features functional Gang of four
adapter yes(implicit class) no yes
bridge no no yes
composite no no yes
decorator yes(stackable trait) no yes
facade no no yes
flyweight no no yes
magnet yes(implicit conversion) no no
proxy no no yes
type classes yes(impilict parameter) no no

Behavioral

Name scala features functional Gang of four
chain of responsibility yes(partial function) yes yes
command no yes yes
loan yes(structural type) yes no
mediator no no yes
memento no no yes
observer no no yes
state no no yes
strategy no yes yes
template method no no yes
visitor no yes yes

Other

Name scala features functional Gang of four
selfless trait yes(companion trait) no no
monad no yes no

Persistence

Name scala features functional Gang of four
data access object no no no
repository no no no

Getting Started

Run sbt assembly to compile, run tests and package all sub-projects.

If you want to operate specific sub-project, use project command in sbt shell to switch sub-project:

> projects          // list all sub-projects
> project builder   // switch to 'builder' sub-project
> project all       // switch to 'all' project which including all sub-projects

License

This project is licensed under the terms of the Apache 2.0 license.

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