Changes for page Code Example: Data Structure Style vs. Object Style

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...	...	@@ -1,30 +1,40 @@
1		-asd
	1	+### Use Cases
2	2
3		-```
4		-type Square struct {
5		- length float
6		-}
	3	+This example is intended to demonstrate the extensibility differences between data structures and objects by extending them with
7	7
8		-type Circle struct {
9		- length float
10		-}
	5	+1. an Area() function (extending behavior)
	6	+1. a rectangle type (extending data type)
11	11
12		-func Area(g GeometricObject) float {
13		- switch (g.type()):
14		- case Circle:
15		- return
16		- case Square:
17		- return ...
18		-}
	8	+### Data Structure Style
19	19
20		-func Circumference(g GeometricObject) float {
21		- ...
22		-}
23		-```
	10	+ struct Square {
	11	+ length float
	12	+ }
	13	+
	14	+ struct Circle {
	15	+ radius float
	16	+ }
	17	+
	18	+ function Circumference(g Object) float {
	19	+ switch type(g):
	20	+ case Square:
	21	+ return 4 * g.length
	22	+ case Circle:
	23	+ return 2 * PI * g.radius
	24	+ }
24	24
	26	+1. Adding a function Area() with the same anatomy as Circumference() is easy, since it only requires adding new code.
	27	+1. Adding a new datatype, Rectangle, is more difficult because it requires touching existing code, namely any functions like Circumference() or Area() that need to be enabled handle this datatype.
	28	+
	29	+####
	30	+
25	25	#### Object-Oriented Style
26	26
27		- class Square {
	33	+ interface GeometricObject {
	34	+ Circumference() float
	35	+ }
	36	+
	37	+ class Square implements GeometricObject {
28	28	length float
29	29
30	30	constructor(length float) {
...	...	@@ -31,16 +31,12 @@
31	31	this.length = length
32	32	}
33	33
34		- func Area() float {
35		- return this.length * this.length
36		- }
37		-
38	38	func Circumference() float {
39	39	return 4 * this.length
40	40	}
41	41	}
42	42
43		- class Circle {
	49	+ class Circle implements GeometricObject {
44	44	radius float
45	45
46	46	constructor(radius float) {
...	...	@@ -47,10 +47,6 @@
47	47	this.radius = radius
48	48	}
49	49
50		- func Area() float {
51		- return PI * this.radius * this.radius
52		- }
53		-
54	54	func Circumference() float {
55	55	return 2 * PI * this.radius
56	56	}