Last modified by chrisby on 2024/03/03 17:01

From version 3.4
edited by chrisby
on 2024/03/03 15:06
Change comment: There is no comment for this version
To version 2.3
edited by chrisby
on 2024/03/03 14:44
Change comment: There is no comment for this version

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... ... @@ -1,39 +1,30 @@
1 -### Use Cases
1 +asd
2 2  
3 -This example is intended to demonstrate the extensibility differences between data structures and objects by extending them with
3 +```
4 +type Square struct {
5 + length float
6 +}
4 4  
5 -1. an Area() function (extending behavior)
6 -1. a rectangle type (extending data type)
8 +type Circle struct {
9 + length float
10 +}
7 7  
8 -### Data Structure Style
12 +func Area(g GeometricObject) float {
13 + switch (g.type()):
14 + case Circle:
15 + return
16 + case Square:
17 + return ...
18 +}
9 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 - }
20 +func Circumference(g GeometricObject) float {
21 + ...
22 +}
23 +```
25 25  
26 -1.
27 -
28 -####
29 -
30 30  #### Object-Oriented Style
31 31  
32 - interface GeometricObject {
33 - Circumference() float
34 - }
35 -
36 - class Square implements GeometricObject {
27 + class Square {
37 37   length float
38 38  
39 39   constructor(length float) {
... ... @@ -40,12 +40,16 @@
40 40   this.length = length
41 41   }
42 42  
34 + func Area() float {
35 + return this.length * this.length
36 + }
37 +
43 43   func Circumference() float {
44 44   return 4 * this.length
45 45   }
46 46   }
47 47  
48 - class Circle implements GeometricObject {
43 + class Circle {
49 49   radius float
50 50  
51 51   constructor(radius float) {
... ... @@ -52,6 +52,10 @@
52 52   this.radius = radius
53 53   }
54 54  
50 + func Area() float {
51 + return PI * this.radius * this.radius
52 + }
53 +
55 55   func Circumference() float {
56 56   return 2 * PI * this.radius
57 57   }