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

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...	...	@@ -1,1 +1,58 @@
1		-```
	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	+ }