A quick dance in the world of Object Oriented Programming

1. YOU DOWN WITH
OOP?

2. Women In Technology
Lecturer Gant Laborde

3. & YOU!
Who are you?

4. Today Schedule
10:00 - 10:15 - Check in and get coffee
10:15 - 11:30 - Workshop
11:30 - 11:50 - Break
11:50 - 12:50 - Workshop
12:50 - 1pm - Final remarks, Survey

5. Mission
To not only show Object Oriented Programming, but to provide
the reasoning and feel the solution actually solve a real world
problem for software as a paradigm.

6. Overview
Other Options
Advantages of OOP
Basics
Inheritance
Polymorphism
Abstraction

7. WARNING:
JavaScript in this workshop is ES6

8. Procedural
Programming

9. Procedural
Programming
Top Down

10. What's the Drawback?
Software Reactivity
Maintaining
Automatic Memory Management
No security of code
No teamwork in code

11. Maintaining
Automatic Memory Management
No security of code
No teamwork in code
Imagine the above as an english essay.
How do we solve this?

12. Object Oriented
Programming
A strategy for breaking code into parts.

13. The Classic OOP Car
Let's Make it Happen

14. Encapsulation

15. Procedural

16. OOP

17. Functional

18. OOP oh so Classy

19. Classes & Objects
Objects are instances of classes

20. Tire Class

21. Tire Objects

22. Let's Code
Ruby
class Cup
def initialize
puts "I'm alive! *SPARKLE*"
@drink_amount = 0
end
def fill
puts "I'm filled up!"
@drink_amount = 100
end
def empty
puts "ALL GONE!"
@drink_amount = 0
end
def quantity
puts @drink_amount
@drink_amount
end
end
Constructor
Class
Methods

23. Let's Code
Java
Constructor
Class
Methods
public class Cup {
public int drinkAmount = 0;
public Cup() {
System.out.println("I'm alive! *SPARKLE*");
drinkAmount = 0;
}
public void fill () {
System.out.println("Fill'er up!");
drinkAmount = 100;
}
public void empty () {
System.out.println("Dump it!");
drinkAmount = 0;
}
public int quantity () {
System.out.println(drinkAmount.toString() + " is left");
return drinkAmount;
}
}

24. Let's Code
JavaScript ES6
Constructor
Class
Methods
class Cup {
constructor() {
console.log("I'm alive!")
this.drinkAmount = 0
}
fill () {
console.log('Cup fillled up')
this.drinkAmount = 100
}
empty () {
console.log('Cup emptied')
this.drinkAmount = 0
}
quantity () {
console.log(`${this.drinkAmount} drink left`)
return this.drinkAmount
}
}

25. Let's Code
JavaScript ES6
JS Bin
https://jsbin.com/buwucuk/1/edit?js,console

26. Let's Code
Ruby FYI

27. Now you!
use JSBin and make an object
Make them different!

28. Static / Class Methods
Functionality built into design

29. What does this give us?

30. Volume Helper
Ruby
def self.volume radius, height
puts Math::PI * radius**2 * height
end

31. Volume Helper
JavaScript ES6
static volume(radius, height) {
const volume = Math.PI * Math.pow(radius, 2) * height
console.log(volume)
}
https://jsbin.com/buwucuk/3/edit?js,console

32. Inheritance
Taking on the functionality of an existing class

33. What does this give us?

34. Inheritance
Taking on the functionality of an existing class
import disney.pocahontas.plot;
public class Avatar extends pocahontas {
public plot() {
setTimeEra("Future");
setPlanet("NotEarth");
}
}

35. Inheritence
Cup Example
With Ruby
class MojoCup < Cup
def initialize
super
puts "Welcome to Mojo Coffee!"
end
end

36. Inheritence
Cup Example
With JavaScript ES6
class MojoCup extends Cup {
constructor() {
super()
console.log('Welcome to Mojo')
}
}
https://jsbin.com/buwucuk/2/edit?js,console

37. Base Class
Superclass
Inherited Class
Subclass

38. Now You Try
With your JSBin Create a class
and extend it!

39. What happens when...
a subclass implements the
same method as its superclass?

40. Polymorphism

41. Objects Behaving
let shape = new Square() let shape = new Triangle()
shape.draw()

42. What does this give us?

43. Others?
Cups
Car Doors
Animals

44. Abstraction Philosophy

45. Circle
A cirlce is a geometric shape
with known properties.
Wheel
An abstraction based on
circle with some known
physical properties
Based on wheel and perhaps could have an
instance.
Goodyear Tire

46. What does this give us?

47. Objects MisBehaving
let shape = 5 let shape = new Triangle()
shape.draw()

48. Abstract Objects
class Square extends Shape {
String draw() {
return "Square";
}
}
class Triangle extends Shape {
String draw() {
return "Triangle";
}
}
abstract class Shape {
abstract String draw();
}
void showEveryone(final Shape shape) {
println(shape.draw());
}
int main() {
showEveryone(new Square());
showEveryone(new Triangle());
}

49. Abstract means you
can't create an instance
That's some opinion!
Keep it focussed on the project.
you can always extend it to add functionality!
or can you?....

50. Sealed && Final
C# and Java
That can be a pretty big decision

51. Static Typed Languages
Static Type Checking
Name some static typed languages?
Dynamic languages?
Destructor methods?

52. Interfaces
Enforcing common ground
Whatever you do, you must implement
.draw

53. Interfaces exist in
, , , , , , , , ,
, , , ,
...and more!
Ada C# D Dart Delphi Go Java Logtalk Object Pascal
Objective-C PHP Racket Seed7 Swift

54. Interfaces vs Abstract

55. Examples
https://github.com/GantMan/furry_destroyer
https://github.com/IconoclastLabs/rubytrivia

56. Call to Action!
Where can you practice these
skills?

57. Closing up
Final Remarks + Survey