SlideShare a Scribd company logo
1 of 104
Download to read offline
— You must unlearn what you have learned.




       koji.shimada@enishi-tech.com

2010   12   5
2010   12   5
2010   12   5
2010   12   5
2010   12   5
Photo by tmaeda
2010   12   5
2010   12   5
2010   12   5
2010   12   5
2010   12   5
2010   12   5
from Sapporo,
                with Love for Ruby



                               Photo by darashi
2010   12   5
2010   12   5
— You must unlearn what you have learned.




       koji.shimada@enishi-tech.com

2010   12   5
2010   12   5
2010   12   5
R u by




2010   12   5
2010   12   5
-   RubyKaigi2008


2010   12   5
QWAN on Ruby


2010   12   5
http://www.flickr.com/photos/33224129@N00/3301269103/
2010   12   5
2010   12   5
2010   12   5
2010   12   5
2010   12   5
2010   12   5
2010   12   5
2010   12   5
2010   12   5
2010   12   5
2010   12   5
2010   12   5
2010   12   5
•
                •
                •


2010   12   5
2010   12   5
No




2010   12   5
2010   12   5
2010   12   5
Strategy




2010   12   5
2010   12   5
2010   12   5
2010   12   5
2010   12   5
2010   12   5
2010   12   5
Andrew Hunt and Dave omas
                      e Pragmatic Programmer




2010   12   5
YAGNI

            You Ain’t Gonna Need It



2010   12   5
2010   12   5
2010   12   5
2010   12   5
2010   12   5
2010   12   5
Single Responsibility
                 Open-Closed
                Liscov Substitution
                Interface Segregation
                Dependency Inversion
2010   12   5
http://www.objectclub.jp/community/memorial/
                homepage3.nifty.com/masarl/article/dp-ocp-2.html
2010   12   5
2010   12   5
Expect Unexpected Change




2010   12   5
2010   12   5
2010   12   5
2010   12   5
2010   12   5
Growing
  Object-Oriented
  Software,
  Guided by Tests
  Steve Freeman
  Nat Pryce

2010   12   5
2010   12   5
2010   12   5
2010   12   5
Growing
  Object-Oriented
  Software,
  Guided by Tests
  Steve Freeman
  Nat Pryce

2010   12   5
http://www.flickr.com/photos/barnaby_s/2332109365/
2010   12   5
2010   12   5
2010   12   5
2010   12   5
2010   12   5
2010   12   5
Push Your Self to Learn



2010   12   5
To do good work
                     your tools




2010   12   5
2010   12   5
2010   12   5
http://www.flickr.com/photos/aslakr/14507479/
2010   12   5
ActiveRecord




2010   12   5
2010   12   5
or



2010   12   5
2010   12   5
2010   12   5
2010   12   5
2010   12   5
2010   12   5
2010   12   5
(How)



2010   12   5
(Why)



2010   12   5
2010   12   5
2010   12   5
2010   12   5
http://www.flickr.com/photos/aslakr/14507479/
2010   12   5
2010   12   5
2010   12   5
2010   12   5
Ruby
                 X



2010   12   5
-   RubyKaigi2008


2010   12   5
2010   12   5
I LOVE RUBY




                              24
2010   12   5
2010   12   5
2010   12   5
2010   12   5
— You must unlearn what you have learned.




       koji.shimada@enishi-tech.com

2010   12   5
2010   12   5
2010   12   5

More Related Content

Similar to 20101204 you-must-unlearn-what-you-have-learned (6)

Augmented Reality SPRING 2010
Augmented Reality SPRING 2010Augmented Reality SPRING 2010
Augmented Reality SPRING 2010
 
英語の技術文書を読む会のこと
英語の技術文書を読む会のこと英語の技術文書を読む会のこと
英語の技術文書を読む会のこと
 
How to easily start Agile Development
How to easily start Agile DevelopmentHow to easily start Agile Development
How to easily start Agile Development
 
1204 fitc2010
1204 fitc2010 1204 fitc2010
1204 fitc2010
 
20100226 Jim Coplien Said You Should Foster Generative Scheme In Your System
20100226 Jim Coplien Said You Should Foster Generative Scheme In Your System20100226 Jim Coplien Said You Should Foster Generative Scheme In Your System
20100226 Jim Coplien Said You Should Foster Generative Scheme In Your System
 
Engagement + Promotion
Engagement + PromotionEngagement + Promotion
Engagement + Promotion
 

More from Koji SHIMADA

20110614 hmcc-enishitech
20110614 hmcc-enishitech20110614 hmcc-enishitech
20110614 hmcc-enishitech
Koji SHIMADA
 
20101001-Introduction-to-Developer-Testing-With-Ruby
20101001-Introduction-to-Developer-Testing-With-Ruby20101001-Introduction-to-Developer-Testing-With-Ruby
20101001-Introduction-to-Developer-Testing-With-Ruby
Koji SHIMADA
 
20100626-We-Think-We-Act
20100626-We-Think-We-Act20100626-We-Think-We-Act
20100626-We-Think-We-Act
Koji SHIMADA
 
20100526 The Productive Programmer
20100526 The Productive Programmer20100526 The Productive Programmer
20100526 The Productive Programmer
Koji SHIMADA
 
20100213 Where The Street Has No Name
20100213 Where The Street Has No Name20100213 Where The Street Has No Name
20100213 Where The Street Has No Name
Koji SHIMADA
 
20091030 Uncle Bob Said You Should Be A Professional With Clean Code
20091030 Uncle Bob Said You Should Be A Professional With Clean Code20091030 Uncle Bob Said You Should Be A Professional With Clean Code
20091030 Uncle Bob Said You Should Be A Professional With Clean Code
Koji SHIMADA
 
Our Strategy To Survive In This Hard World(tochigirubykaigi02)
Our Strategy To Survive In This Hard World(tochigirubykaigi02)Our Strategy To Survive In This Hard World(tochigirubykaigi02)
Our Strategy To Survive In This Hard World(tochigirubykaigi02)
Koji SHIMADA
 
RubySapporoDigestAndMore-osc2009do
RubySapporoDigestAndMore-osc2009doRubySapporoDigestAndMore-osc2009do
RubySapporoDigestAndMore-osc2009do
Koji SHIMADA
 
20090124 Pleasantly Programming with Ruby
20090124 Pleasantly Programming with Ruby20090124 Pleasantly Programming with Ruby
20090124 Pleasantly Programming with Ruby
Koji SHIMADA
 
20081220 Rubybonenkai2008 Sapporo
20081220 Rubybonenkai2008 Sapporo20081220 Rubybonenkai2008 Sapporo
20081220 Rubybonenkai2008 Sapporo
Koji SHIMADA
 
20081205 Object Club Reject Talks2008
20081205 Object Club Reject Talks200820081205 Object Club Reject Talks2008
20081205 Object Club Reject Talks2008
Koji SHIMADA
 
Talking About Fluent Interface
Talking About Fluent InterfaceTalking About Fluent Interface
Talking About Fluent Interface
Koji SHIMADA
 
20081004-OSC2008Tokyo/Fall-MetaCon
20081004-OSC2008Tokyo/Fall-MetaCon20081004-OSC2008Tokyo/Fall-MetaCon
20081004-OSC2008Tokyo/Fall-MetaCon
Koji SHIMADA
 
20080823-TransformingPlainTextToHtml
20080823-TransformingPlainTextToHtml20080823-TransformingPlainTextToHtml
20080823-TransformingPlainTextToHtml
Koji SHIMADA
 
20080622 Reject Kaigi2008 Kaigi Freaks
20080622 Reject Kaigi2008 Kaigi Freaks20080622 Reject Kaigi2008 Kaigi Freaks
20080622 Reject Kaigi2008 Kaigi Freaks
Koji SHIMADA
 
20080521-Ruby-on-Rails-Security
20080521-Ruby-on-Rails-Security20080521-Ruby-on-Rails-Security
20080521-Ruby-on-Rails-Security
Koji SHIMADA
 
Ruby札幌2008年の活動に向けて
Ruby札幌2008年の活動に向けてRuby札幌2008年の活動に向けて
Ruby札幌2008年の活動に向けて
Koji SHIMADA
 

More from Koji SHIMADA (20)

20110614 hmcc-enishitech
20110614 hmcc-enishitech20110614 hmcc-enishitech
20110614 hmcc-enishitech
 
20101001-Introduction-to-Developer-Testing-With-Ruby
20101001-Introduction-to-Developer-Testing-With-Ruby20101001-Introduction-to-Developer-Testing-With-Ruby
20101001-Introduction-to-Developer-Testing-With-Ruby
 
20100626-We-Think-We-Act
20100626-We-Think-We-Act20100626-We-Think-We-Act
20100626-We-Think-We-Act
 
20100526 The Productive Programmer
20100526 The Productive Programmer20100526 The Productive Programmer
20100526 The Productive Programmer
 
20100213 Where The Street Has No Name
20100213 Where The Street Has No Name20100213 Where The Street Has No Name
20100213 Where The Street Has No Name
 
20091030 Uncle Bob Said You Should Be A Professional With Clean Code
20091030 Uncle Bob Said You Should Be A Professional With Clean Code20091030 Uncle Bob Said You Should Be A Professional With Clean Code
20091030 Uncle Bob Said You Should Be A Professional With Clean Code
 
Our Strategy To Survive In This Hard World(tochigirubykaigi02)
Our Strategy To Survive In This Hard World(tochigirubykaigi02)Our Strategy To Survive In This Hard World(tochigirubykaigi02)
Our Strategy To Survive In This Hard World(tochigirubykaigi02)
 
RubySapporoDigestAndMore-osc2009do
RubySapporoDigestAndMore-osc2009doRubySapporoDigestAndMore-osc2009do
RubySapporoDigestAndMore-osc2009do
 
20090124 Pleasantly Programming with Ruby
20090124 Pleasantly Programming with Ruby20090124 Pleasantly Programming with Ruby
20090124 Pleasantly Programming with Ruby
 
20081220 Rubybonenkai2008 Sapporo
20081220 Rubybonenkai2008 Sapporo20081220 Rubybonenkai2008 Sapporo
20081220 Rubybonenkai2008 Sapporo
 
20081205 Object Club Reject Talks2008
20081205 Object Club Reject Talks200820081205 Object Club Reject Talks2008
20081205 Object Club Reject Talks2008
 
Talking About Fluent Interface
Talking About Fluent InterfaceTalking About Fluent Interface
Talking About Fluent Interface
 
20081004-OSC2008Tokyo/Fall-MetaCon
20081004-OSC2008Tokyo/Fall-MetaCon20081004-OSC2008Tokyo/Fall-MetaCon
20081004-OSC2008Tokyo/Fall-MetaCon
 
20080823-TransformingPlainTextToHtml
20080823-TransformingPlainTextToHtml20080823-TransformingPlainTextToHtml
20080823-TransformingPlainTextToHtml
 
20080730-WelcomeToLifeWithRuby
20080730-WelcomeToLifeWithRuby20080730-WelcomeToLifeWithRuby
20080730-WelcomeToLifeWithRuby
 
20080622 Reject Kaigi2008 Kaigi Freaks
20080622 Reject Kaigi2008 Kaigi Freaks20080622 Reject Kaigi2008 Kaigi Freaks
20080622 Reject Kaigi2008 Kaigi Freaks
 
20080521-Ruby-on-Rails-Security
20080521-Ruby-on-Rails-Security20080521-Ruby-on-Rails-Security
20080521-Ruby-on-Rails-Security
 
The Hitchhiker’s Guide To Dsl
The Hitchhiker’s Guide To DslThe Hitchhiker’s Guide To Dsl
The Hitchhiker’s Guide To Dsl
 
Why-is-ImplementationPattterns-important-so-much
Why-is-ImplementationPattterns-important-so-muchWhy-is-ImplementationPattterns-important-so-much
Why-is-ImplementationPattterns-important-so-much
 
Ruby札幌2008年の活動に向けて
Ruby札幌2008年の活動に向けてRuby札幌2008年の活動に向けて
Ruby札幌2008年の活動に向けて
 

Recently uploaded

Histor y of HAM Radio presentation slide
Histor y of HAM Radio presentation slideHistor y of HAM Radio presentation slide
Histor y of HAM Radio presentation slide
vu2urc
 
+971581248768>> SAFE AND ORIGINAL ABORTION PILLS FOR SALE IN DUBAI AND ABUDHA...
+971581248768>> SAFE AND ORIGINAL ABORTION PILLS FOR SALE IN DUBAI AND ABUDHA...+971581248768>> SAFE AND ORIGINAL ABORTION PILLS FOR SALE IN DUBAI AND ABUDHA...
+971581248768>> SAFE AND ORIGINAL ABORTION PILLS FOR SALE IN DUBAI AND ABUDHA...
?#DUbAI#??##{{(☎️+971_581248768%)**%*]'#abortion pills for sale in dubai@
 

Recently uploaded (20)

HTML Injection Attacks: Impact and Mitigation Strategies
HTML Injection Attacks: Impact and Mitigation StrategiesHTML Injection Attacks: Impact and Mitigation Strategies
HTML Injection Attacks: Impact and Mitigation Strategies
 
Axa Assurance Maroc - Insurer Innovation Award 2024
Axa Assurance Maroc - Insurer Innovation Award 2024Axa Assurance Maroc - Insurer Innovation Award 2024
Axa Assurance Maroc - Insurer Innovation Award 2024
 
Apidays New York 2024 - The value of a flexible API Management solution for O...
Apidays New York 2024 - The value of a flexible API Management solution for O...Apidays New York 2024 - The value of a flexible API Management solution for O...
Apidays New York 2024 - The value of a flexible API Management solution for O...
 
A Year of the Servo Reboot: Where Are We Now?
A Year of the Servo Reboot: Where Are We Now?A Year of the Servo Reboot: Where Are We Now?
A Year of the Servo Reboot: Where Are We Now?
 
GenCyber Cyber Security Day Presentation
GenCyber Cyber Security Day PresentationGenCyber Cyber Security Day Presentation
GenCyber Cyber Security Day Presentation
 
ProductAnonymous-April2024-WinProductDiscovery-MelissaKlemke
ProductAnonymous-April2024-WinProductDiscovery-MelissaKlemkeProductAnonymous-April2024-WinProductDiscovery-MelissaKlemke
ProductAnonymous-April2024-WinProductDiscovery-MelissaKlemke
 
Strategize a Smooth Tenant-to-tenant Migration and Copilot Takeoff
Strategize a Smooth Tenant-to-tenant Migration and Copilot TakeoffStrategize a Smooth Tenant-to-tenant Migration and Copilot Takeoff
Strategize a Smooth Tenant-to-tenant Migration and Copilot Takeoff
 
Scaling API-first – The story of a global engineering organization
Scaling API-first – The story of a global engineering organizationScaling API-first – The story of a global engineering organization
Scaling API-first – The story of a global engineering organization
 
Tata AIG General Insurance Company - Insurer Innovation Award 2024
Tata AIG General Insurance Company - Insurer Innovation Award 2024Tata AIG General Insurance Company - Insurer Innovation Award 2024
Tata AIG General Insurance Company - Insurer Innovation Award 2024
 
Histor y of HAM Radio presentation slide
Histor y of HAM Radio presentation slideHistor y of HAM Radio presentation slide
Histor y of HAM Radio presentation slide
 
Exploring the Future Potential of AI-Enabled Smartphone Processors
Exploring the Future Potential of AI-Enabled Smartphone ProcessorsExploring the Future Potential of AI-Enabled Smartphone Processors
Exploring the Future Potential of AI-Enabled Smartphone Processors
 
Tech Trends Report 2024 Future Today Institute.pdf
Tech Trends Report 2024 Future Today Institute.pdfTech Trends Report 2024 Future Today Institute.pdf
Tech Trends Report 2024 Future Today Institute.pdf
 
Mastering MySQL Database Architecture: Deep Dive into MySQL Shell and MySQL R...
Mastering MySQL Database Architecture: Deep Dive into MySQL Shell and MySQL R...Mastering MySQL Database Architecture: Deep Dive into MySQL Shell and MySQL R...
Mastering MySQL Database Architecture: Deep Dive into MySQL Shell and MySQL R...
 
Strategies for Landing an Oracle DBA Job as a Fresher
Strategies for Landing an Oracle DBA Job as a FresherStrategies for Landing an Oracle DBA Job as a Fresher
Strategies for Landing an Oracle DBA Job as a Fresher
 
Powerful Google developer tools for immediate impact! (2023-24 C)
Powerful Google developer tools for immediate impact! (2023-24 C)Powerful Google developer tools for immediate impact! (2023-24 C)
Powerful Google developer tools for immediate impact! (2023-24 C)
 
Handwritten Text Recognition for manuscripts and early printed texts
Handwritten Text Recognition for manuscripts and early printed textsHandwritten Text Recognition for manuscripts and early printed texts
Handwritten Text Recognition for manuscripts and early printed texts
 
presentation ICT roal in 21st century education
presentation ICT roal in 21st century educationpresentation ICT roal in 21st century education
presentation ICT roal in 21st century education
 
🐬 The future of MySQL is Postgres 🐘
🐬  The future of MySQL is Postgres   🐘🐬  The future of MySQL is Postgres   🐘
🐬 The future of MySQL is Postgres 🐘
 
Real Time Object Detection Using Open CV
Real Time Object Detection Using Open CVReal Time Object Detection Using Open CV
Real Time Object Detection Using Open CV
 
+971581248768>> SAFE AND ORIGINAL ABORTION PILLS FOR SALE IN DUBAI AND ABUDHA...
+971581248768>> SAFE AND ORIGINAL ABORTION PILLS FOR SALE IN DUBAI AND ABUDHA...+971581248768>> SAFE AND ORIGINAL ABORTION PILLS FOR SALE IN DUBAI AND ABUDHA...
+971581248768>> SAFE AND ORIGINAL ABORTION PILLS FOR SALE IN DUBAI AND ABUDHA...
 

20101204 you-must-unlearn-what-you-have-learned