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Version 3.4 by chrisby on 2024/03/03 15:06
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1 ### Use Cases
2
3 This example is intended to demonstrate the extensibility differences between data structures and objects by extending them with
4
5 1. an Area() function (extending behavior)
6 1. a rectangle type (extending data type)
7
8 ### Data Structure Style
9
10 type Square struct {
11 length float
12 }
13
14 type Circle struct {
15 radius float
16 }
17
18 func 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 }
25
26 1.
27
28 ####
29
30 #### Object-Oriented Style
31
32 interface GeometricObject {
33 Circumference() float
34 }
35
36 class Square implements GeometricObject {
37 length float
38
39 constructor(length float) {
40 this.length = length
41 }
42
43 func Circumference() float {
44 return 4 * this.length
45 }
46 }
47
48 class Circle implements GeometricObject {
49 radius float
50
51 constructor(radius float) {
52 this.radius = radius
53 }
54
55 func Circumference() float {
56 return 2 * PI * this.radius
57 }
58 }