Object-Oriented Programming Basics with Smalltalk

Presented at CodeMash 2016

Transcript

1. SMALLTALK
   OBJECT-ORIENTED PROGRAMMING BASICS
   

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2. @statonjr OOP Basics with Smalltalk
   100 Dealerships
   10,000+ Employees
   

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3. @statonjr OOP Basics with Smalltalk
   OVERVIEW
   

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4. @statonjr OOP Basics with Smalltalk
   What is
   OBJECT-ORIENTED PROGRAMMING?
   

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6. @statonjr OOP Basics with Smalltalk
   1966
   

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7. @statonjr OOP Basics with Smalltalk
   1970
   

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8. @statonjr OOP Basics with Smalltalk
   1972
   

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9. @statonjr OOP Basics with Smalltalk
   Six Main Ideas of Smalltalk
   

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10. @statonjr OOP Basics with Smalltalk
    Everything is an object
    

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11. @statonjr OOP Basics with Smalltalk
    Objects communicate by sending and receiving messages
    

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12. @statonjr OOP Basics with Smalltalk
    Objects have their own memory
    

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13. @statonjr OOP Basics with Smalltalk
    Every object is an instance of a class
    

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14. @statonjr OOP Basics with Smalltalk
    The class holds the shared behavior for its instances
    

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15. @statonjr OOP Basics with Smalltalk
    To eval a program list, control is passed to the first
    object and the remainder is treated as its message
    

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16. @statonjr OOP Basics with Smalltalk
    1976
    

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17. @statonjr OOP Basics with Smalltalk
    

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18. @statonjr OOP Basics with Smalltalk
    Everything is an object
    

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19. @statonjr OOP Basics with Smalltalk
    Data
    Code
    

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20. @statonjr OOP Basics with Smalltalk
    Data
    Code Methods
    

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21. @statonjr OOP Basics with Smalltalk
    Data
    Code Methods
    Variables
    

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22. GENERALLY, WE DON'T WANT THE
    PROGRAMMER TO BE MESSING
    AROUND WITH STATE, WHETHER
    SIMULATED OR NOT.
    Alan Kay
    THE EARLY HISTORY OF SMALLTALK
    

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23. @statonjr OOP Basics with Smalltalk
    Objects communicate by sending and receiving messages
    

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24. @statonjr OOP Basics with Smalltalk
    SENDER RECEIVER
    Message
    Return Value
    

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25. @statonjr OOP Basics with Smalltalk
    Every object is an instance of a class
    

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26. @statonjr OOP Basics with Smalltalk
    Class Instances
    

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27. @statonjr OOP Basics with Smalltalk
    Class Instance
    Class Methods Class Variables
    Instance Methods Instance Variables
    Instance Methods Instance Variables
    

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28. @statonjr OOP Basics with Smalltalk
    The class holds the shared behavior for its instances
    

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29. @statonjr OOP Basics with Smalltalk
    COMPOSITION
    

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30. @statonjr OOP Basics with Smalltalk
    INHERITANCE
    

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31. @statonjr OOP Basics with Smalltalk
    name
    age
    grade
    Person
    Student
    

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32. @statonjr OOP Basics with Smalltalk
    POLYMORPHISM
    

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33. @statonjr OOP Basics with Smalltalk
    SMALLTALK SYNTAX
    

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34. @statonjr OOP Basics with Smalltalk
    SMALLTALK SYNTAX
    

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35. @statonjr OOP Basics with Smalltalk
    SMALLTALK SYNTAX
    Tokens: Identifiers, Numbers, ‘Strings’, “Comments”, Binary
    Operators, Keywords, Special Tokens
    

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36. @statonjr OOP Basics with Smalltalk
    SMALLTALK SYNTAX
    Special Tokens: #:^’|”;()[]
    Tokens: Identifiers, Numbers, ‘Strings’, “Comments”, Binary
    Operators, Keywords, Special Tokens
    

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37. @statonjr OOP Basics with Smalltalk
    SMALLTALK SYNTAX
    Special Tokens: #:^’|”;()[]
    Tokens: Identifiers, Numbers, ‘Strings’, “Comments”, Binary
    Operators, Keywords, Special Tokens
    Reserved Words: nil false true self super
    

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38. @statonjr OOP Basics with Smalltalk
    SMALLTALK SYNTAX
    Special Tokens: #:^’|”;()[]
    Tokens: Identifiers, Numbers, ‘Strings’, “Comments”, Binary
    Operators, Keywords, Special Tokens
    Reserved Words: nil false true self super
    Syntactic Forms: Unary messages, Binary messages,
    Keyword messages, Block closures, Return Value,
    Method definition, Assignment, Cascade
    

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39. @statonjr OOP Basics with Smalltalk
    DEMO
    

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40. @statonjr OOP Basics with Smalltalk
    RESOURCES
    http://pharo.org
    http://pharobyexample.org
    Smalltalk-80: The Language and Its Implementation
    http://files.pharo.org/books/
    ProfStef go
    

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