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

Version 3.2 by chrisby on 2024/03/03 14:50

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
	11	func Area(g GeometricObject) float {
3.2	12	switch type(g):
	13	case Square:
	14	return g.length * g.length
2.4	15	case Circle:
3.2	16	return PI * g.radius * g.radius
2.4	17	}
	18
	19	func Circumference(g GeometricObject) float {
3.2	20	switch type(g):
	21	case Square:
	22	return 4 * g.length
	23	case Circle:
	24	return 2 * PI * g.radius
2.4	25	}
2.1	26
2.3	27	#### Object-Oriented Style
2.2	28
2.3	29	class Square {
	30	length float
	31
	32	constructor(length float) {
	33	this.length = length
	34	}
	35
	36	func Area() float {
	37	return this.length * this.length
	38	}
	39
	40	func Circumference() float {
	41	return 4 * this.length
	42	}
	43	}
	44
	45	class Circle {
	46	radius float
	47
	48	constructor(radius float) {
	49	this.radius = radius
	50	}
	51
	52	func Area() float {
	53	return PI * this.radius * this.radius
	54	}
	55
	56	func Circumference() float {
	57	return 2 * PI * this.radius
	58	}
	59	}