Dynamic Languages Are The Future

Mar 9, 20102 likes1,002 views

These are the slides from Robert "Uncle Bob" Martin's talk at the Chicago Day of Mobile event held in March 2010. �ݺ�ߣs posted with permission from Bob.

Dynamic Languages
are
The Future

Robert C. Martin
Object Mentor Inc.

Copyright ? 2010 by Robert C. Martin
All Rights Reserved.

Tuesday, March 9, 2010

Static Languages Rule.

Tuesday, March 9, 2010

1980: C vs. Pascal

Tuesday, March 9, 2010

1986: C++, A ��Better�� C

Tuesday, March 9, 2010

1990s: C++ vs Smalltalk
Productivity vs. Safety

Tuesday, March 9, 2010

Why are Dynamic Languages
more Productive?
OO.

Tuesday, March 9, 2010

Dependency Management
and
DIP

Tuesday, March 9, 2010

Dependency Inversion

? Source code dependencies oppose the flow of control

Caller

Flow of Control
Interface

Callee

Tuesday, March 9, 2010

The Ultimate Problem of Static Typing.

Tuesday, March 9, 2010

Dynamically Typed Solution
? All dependencies are run-time only.
? Dashed lines don��t know type.
? Solid lines know type.
Shape
Factory
Application
make_square
make_circle

Square Circle

Tuesday, March 9, 2010

Fewer lines. More Flexible.
Productive.

Tuesday, March 9, 2010

Productivity of Languages.

? http://barnesc.blogspot.com/2006/05/programming-language-productivity.html

Tuesday, March 9, 2010

Productivity of Languages.

? http://wwwipd.ira.uka.de/~prechelt/Biblio/jccpprtTR.pdf

Tuesday, March 9, 2010

But, in the end, safety won.

Tuesday, March 9, 2010

The Litany of Benefits.

Tuesday, March 9, 2010

Professionalism and TDD

Tuesday, March 9, 2010

TDD safety replaces Static
safety?

Tuesday, March 9, 2010

fin
? unclebob @ objectmentor.com
? fitnesse.org
? cleancodeproject.com

Tuesday, March 9, 2010

��Too easy to make a mess��
-- Ward Cunningham

Tuesday, March 9, 2010

20 years wandering in the
wilderness.

Tuesday, March 9, 2010

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Dynamic Languages Are The Future

2. Static Languages Rule. Tuesday, March 9, 2010

3. 1980: C vs. Pascal Tuesday, March 9, 2010

4. 1986: C++, A ��Better�� C Tuesday, March 9, 2010

5. 1990s: C++ vs Smalltalk Productivity vs. Safety Tuesday, March 9, 2010

6. Why are Dynamic Languages more Productive? OO. Tuesday, March 9, 2010

7. Dependency Management and DIP Tuesday, March 9, 2010

8. Dependency Inversion ? Source code dependencies oppose the flow of control Caller Flow of Control Interface Callee Tuesday, March 9, 2010

9. The Ultimate Problem of Static Typing. Tuesday, March 9, 2010

10. Dynamically Typed Solution ? All dependencies are run-time only. ? Dashed lines don��t know type. ? Solid lines know type. Shape Factory Application make_square make_circle Square Circle Tuesday, March 9, 2010

11. Fewer lines. More Flexible. Productive. Tuesday, March 9, 2010

12. Productivity of Languages. ? http://barnesc.blogspot.com/2006/05/programming-language-productivity.html Tuesday, March 9, 2010

13. Productivity of Languages. ? http://wwwipd.ira.uka.de/~prechelt/Biblio/jccpprtTR.pdf Tuesday, March 9, 2010

14. But, in the end, safety won. Tuesday, March 9, 2010

15. 1999: TDD Tuesday, March 9, 2010

16. The Three Laws Tuesday, March 9, 2010

17. The Litany of Benefits. Tuesday, March 9, 2010

18. Professionalism and TDD Tuesday, March 9, 2010

19. TDD safety replaces Static safety? Tuesday, March 9, 2010

20. fin ? unclebob @ objectmentor.com ? fitnesse.org ? cleancodeproject.com Tuesday, March 9, 2010

21. ��Too easy to make a mess�� -- Ward Cunningham Tuesday, March 9, 2010

22. 20 years wandering in the wilderness. Tuesday, March 9, 2010

�ݺ�ߣ

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