Upgrade to Pro — share decks privately, control downloads, hide ads and more …

State Pattern From GoF

Avatar for Chris Bushell Chris Bushell
July 07, 2010
Programming
1
67

State Pattern From GoF

Prepared for the Melbourne Patterns Group

Avatar for Chris Bushell

Chris Bushell

July 07, 2010
Tweet

More Decks by Chris Bushell

See All by Chris Bushell
Test Automation for Packaged Systems: Yes You Can!
Avatar for Chris Bushell cbushell
0
63
Introduction to Pair Programming
Avatar for Chris Bushell cbushell
1
120
An Introduction to BDD
Avatar for Chris Bushell cbushell
5
170
An Introduction to HTTP
Avatar for Chris Bushell cbushell
2
130
Agile Test Automation
Avatar for Chris Bushell cbushell
2
180
Working Effectively With Legacy Code
Avatar for Chris Bushell cbushell
4
250
Jasmine, BDD for JavaScript
Avatar for Chris Bushell cbushell
1
120
Branches Are For Trees. How to Develop Software Without Them
Avatar for Chris Bushell cbushell
1
110
Continuous Integration, fast builds and Flot
Avatar for Chris Bushell cbushell
2
66

Other Decks in Programming

See All in Programming
AIのバカさ加減に怒る前にやっておくこと
Avatar for k2moons blueeventhorizon
0
160
CSC509 Lecture 09
Avatar for Javier Gonzalez-Sanchez javiergs
PRO
0
290
Functional Calisthenics in Kotlin: Kotlinで「関数型エクササイズ」を実践しよう
Avatar for Kent OHASHI lagenorhynque
0
110
GitHub Copilotを使いこなせ！/mastering_github_copilot!
Avatar for Kota Kageyama kotakageyama
2
870
What’s Fair is FAIR: A Decentralised Future for WordPress Distribution
Avatar for Ryan McCue rmccue
0
150
What's New in Web AI?
Avatar for Christian Liebel christianliebel
PRO
0
120
Bakuraku E2E Scenario Test System Architecture #bakuraku_qa_study
Avatar for teyamagu teyamagu
PRO
0
660
Eloquentを使ってどこまでコードの治安を保てるのか？を新人が考察してみた
Avatar for ito_kohhh itokoh0405
0
3.1k
HTTPじゃ遅すぎる！ SwitchBotを自作ハブで動かして学ぶBLE通信
Avatar for Shoichi Ochi occhi
0
230
2026年向け会社紹介資料
Avatar for Yasutaka misu
0
150
歴史から学ぶ「Why PHP？」 PHPを書く理由を改めて理解する / Learning from History: “Why PHP?” Rediscovering the Reasons for Writing PHP
Avatar for shiro seike seike460
PRO
0
140
CSC509 Lecture 10
Avatar for Javier Gonzalez-Sanchez javiergs
PRO
0
170

Featured

See All Featured
Principles of Awesome APIs and How to Build Them.
Avatar for Keavy McMinn keavy
127
17k
Large-scale JavaScript Application Architecture
Avatar for Addy Osmani addyosmani
514
110k
Refactoring Trust on Your Teams (GOTO; Chicago 2020)
Avatar for Rebecca Miller-Webster rmw
35
3.2k
Thoughts on Productivity
Avatar for Jon Yablonski jonyablonski
73
4.9k
Learning to Love Humans: Emotional Interface Design
Avatar for Aarron Walter aarron
274
41k
Done Done
Avatar for chrislema chrislema
186
16k
Testing 201, or: Great Expectations
Avatar for Joseph Mastey jmmastey
46
7.8k
How to Ace a Technical Interview
Avatar for Jacob Kaplan-Moss jacobian
280
24k
The Art of Programming - Codeland 2020
Avatar for Erika Heidi erikaheidi
56
14k
Art, The Web, and Tiny UX
Avatar for Lynn Fisher lynnandtonic
303
21k
Design and Strategy: How to Deal with People Who Don’t "Get" Design
Avatar for Morgane Peng morganepeng
132
19k
JavaScript: Past, Present, and Future - NDC Porto 2020
Avatar for David Neal reverentgeek
52
5.7k

Transcript

  1. State  Pa'ern  From  GoF   Chris  Bushell  7th  July  2010

       

  2. Mo<va<on   “Allow  an  object  to  alter  its  behavior  when

     its   internal  state  changes”  

  3. Code  

  4. Applicability   •  Behavior  depends  on  state   •  Opera<ons

     have  large  condi<onal  statements   which  depend  on  state  

  5. Par<cipants  

  6. Collabora<ons   •  Context  and  Concrete  State   •  Context

     is  primary  interface  for  clients  

  7. Consequences   •  Localizes  state  specific  behavior.  Avoids  code  

    duplica<on   •  State  changes  are  well  defined,  atomic   opera<ons   •  State  objects  can  be  shared  

  8. Implementa<on   •  Context  or  Concrete  State  defines  transi<ons?  

    •  Table  based  approach  to  defining  transi<ons   •  Singleton,  Flyweight