Wiki source code of Code Example: Data Structure Style vs. Object Style

Version 3.3 by chrisby on 2024/03/03 14:57

version	line-number	content
2.4	1	### Data Structure Style
2.1	2
2.4	3	type Square struct {
	4	length float
	5	}
	6
	7	type Circle struct {
3.2	8	radius float
2.4	9	}
	10
3.3	11	func Circumference(g Object) float {
3.2	12	switch type(g):
	13	case Square:
	14	return 4 * g.length
	15	case Circle:
	16	return 2 * PI * g.radius
2.4	17	}
2.1	18
3.3	19	*
	20
2.3	21	#### Object-Oriented Style
2.2	22
3.3	23	interface GeometricObject {
	24	Circumference() float
	25	}
	26
	27	class Square implements GeometricObject {
2.3	28	length float
	29
	30	constructor(length float) {
	31	this.length = length
	32	}
	33
	34	func Circumference() float {
	35	return 4 * this.length
	36	}
	37	}
	38
3.3	39	class Circle implements GeometricObject {
2.3	40	radius float
	41
	42	constructor(radius float) {
	43	this.radius = radius
	44	}
	45
	46	func Circumference() float {
	47	return 2 * PI * this.radius
	48	}
	49	}