Talk at Regional Scrum Gethering Ecuador 2015

1. agile software development & services
Objects: the Misunderstood
Paradigm
Hernán Wilkinson
Twitter: @HernanWilkinson
Blog: objectmodels.blogspot.com
www.10pines.com

2. Why a talk about the Object
Paradigm?

3. Some examples
- Arrays
- IllegalFormatException/NoSuchElement
Exception
- Cloneable/Serializable
- Calendar
- Calendar/Timer

4. There must be
another way!!

5. Paradigm

6. Object Oriented Paradigm
• Mainly Two Definitions
• Founding one (pure)
• Not Founding one  (not pure)

7. Little bit of History - Simula 67
 Software as a Model!
 Organization of Knowledge
 History tip:
 Goto Considered Harmfull – 68
 Structured Programming – 71
(using Simula 67 as prog. lang.!!)

8. Smalltalk (70s)
 Xerox Parc - LRG
Alan Kay
Dan Ingalls
Adele Goldberg

9. Smalltalk (70s)
Lisp
Simula 67
Flex Machine
DynaBook
Augment Children
Comprehention
Smalltalk
(72,74,76,78,80)
GUI - IDE
Object Oriented
VM
http://www.youtube.com/watch?v=AuXCc7WSczM

10. C++ (78 starts with C with Classes)

11. Xerox Parc & Steve Jobs

12. OO Goals
• Augment human intelect
• Help in Education

13. Principles
• Simplicity
• Consistency
• Inmediate Feedbak
• Direct Manipulation
• Open
• Software as a Model
(based on Brunner’s/Piaget’s ideas)

14. Rules
• Everything is an Object
• Everything is done sending Messages
• Sintax:
object message

15. What’s an Object?
(example)

16. What’s a Message?
(example)

17. What’s a Class then?
(example)

18. What’s Data?
(example)

19. What’s Code?
(example)

20. What’s a good Model?
(example)

21. What’s Inmediate Feedback? Why?
What’s Direct Manipulation? Why?
(we saw many examples already )

22. Real life examples
• Web application
• Persistence

23. What do we loose without
these characteristics?

24. What can we do?
• Learn other languages
• Read more than what the “market” uses
• Get freed from the language!
• Get freed from the frameworks!
• Look for your own experiences

25. You are advised!
No complaints accepted!

26. Questions?

27. agile software development & services
Muchas gracias!
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twitter: @10Pines
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