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

State Pattern From GoF

Sponsored · Ship Features Fearlessly Turn features on and off without deploys. Used by thousands of Ruby developers. →
Avatar for Chris Bushell Chris Bushell
July 07, 2010
Programming
1
68

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
130
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
75

Other Decks in Programming

See All in Programming
個人開発は儲からない - それでも開発開始1ヶ月で300万円売り上げた方法
Avatar for Taishi Yamasaki taishiyade
0
110
プロダクトオーナーから見たSOC2 _SOC2ゆるミートアップ#2
Avatar for Kenta Suzuki kekekenta
0
250
NetBSD+Raspberry Piで 本物のPSGを鳴らすデモを OSC駆動の７日間で作った話 / OSC2026Osaka
Avatar for Izumi Tsutsui tsutsui
1
120
[KNOTS 2026登壇資料]AIで拡張‧交差する プロダクト開発のプロセス および携わるメンバーの役割
Avatar for hisatake hisatake
0
330
CSC307 Lecture 08
Avatar for Javier Gonzalez-Sanchez javiergs
PRO
0
690
責任感のあるCloudWatchアラームを設計しよう
Avatar for アキキー akihisaikeda
3
190
今から始めるClaude Code超入門
Avatar for 448jp | OKI Yoshiya 448jp
8
9.4k
OSSとなったswift-buildで Xcodeのビルドを差し替えられるため 自分でXcodeを直せる時代になっている ダイアモンド問題編
Avatar for yimajo yimajo
3
650
CSC307 Lecture 10
Avatar for Javier Gonzalez-Sanchez javiergs
PRO
1
690
今更考える「単一責任原則」 / Thinking about the Single Responsibility Principle
Avatar for philomagi tooppoo
1
460
AI主導でFastAPIのWebサービスを作るときに 人間が構造化すべき境界線
Avatar for Jun okazaki okajun35
0
130
SourceGeneratorのススメ
Avatar for tkym htkym
0
610

Featured

See All Featured
Put a Button on it: Removing Barriers to Going Fast.
Avatar for kastner kastner
60
4.2k
HDC tutorial
Avatar for Michiel Stock michielstock
1
440
Six Lessons from altMBA
Avatar for Skipper Chong Warson skipperchong
29
4.2k
Rebuilding a faster, lazier Slack
Avatar for samanthasiow samanthasiow
85
9.4k
How to Get Subject Matter Experts Bought In and Actively Contributing to SEO & PR Initiatives.
Avatar for Liv Day livdayseo
0
72
Heart Work Chapter 1 - Part 1
Avatar for Lake Fama lfama
PRO
5
35k
The untapped power of vector embeddings
Avatar for Frank van Dijk frankvandijk
2
1.6k
How to build a perfect <img>
Avatar for Jono Alderson jonoalderson
1
5.2k
Bridging the Design Gap: How Collaborative Modelling removes blockers to flow between stakeholders and teams @FastFlow conf
Avatar for Kenny Baas-Schwegler baasie
0
460
[Rails World 2023 - Day 1 Closing Keynote] - The Magic of Rails
Avatar for Eileen M. Uchitelle eileencodes
38
2.7k
Learning to Love Humans: Emotional Interface Design
Avatar for Aarron Walter aarron
275
41k
Improving Core Web Vitals using Speculation Rules API
Avatar for Sergey Chernyshev sergeychernyshev
21
1.4k

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