Robert C. Martin discusses the evolution of programming languages, emphasizing the productivity benefits of dynamic languages over static ones. He argues that while dynamic languages allow for more flexibility and require fewer lines of code, static typing has historically been favored for safety. The document touches on concepts like dependency management and test-driven development as key factors influencing programming language effectiveness.

1. Dynamic Languages
are
The Future
Robert C. Martin
Object Mentor Inc.
Copyright © 2010 by Robert C. Martin
All Rights Reserved.
Tuesday, March 9, 2010

2. Static Languages Rule.
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3. 1980: C vs. Pascal
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4. 1986: C++, A “Better” C
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5. 1990s: C++ vs Smalltalk
Productivity vs. Safety
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6. Why are Dynamic Languages
more Productive?
OO.
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7. Dependency Management
and
DIP
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8. Dependency Inversion
 Source code dependencies oppose the flow of control
Caller
Flow of Control
Interface
Callee
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9. The Ultimate Problem of Static Typing.
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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
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11. Fewer lines. More Flexible.
Productive.
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12. Productivity of Languages.
 http://barnesc.blogspot.com/2006/05/programming-language-productivity.html
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13. Productivity of Languages.
 http://wwwipd.ira.uka.de/~prechelt/Biblio/jccpprtTR.pdf
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14. But, in the end, safety won.
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15. 1999: TDD
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16. The Three Laws
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17. The Litany of Benefits.
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18. Professionalism and TDD
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19. TDD safety replaces Static
safety?
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20. fin
• unclebob @ objectmentor.com
• fitnesse.org
• cleancodeproject.com
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21. “Too easy to make a mess”
-- Ward Cunningham
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22. 20 years wandering in the
wilderness.
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