Use Cases
This example is intended to demonstrate the extensibility differences between data structures and objects by extending them with
- an Area() function (extending behavior)
- a rectangle type (extending data type)
Data Structure Style
type Square struct {
length float
}
type Circle struct {
radius float
}
func Circumference(g Object) float {
switch type(g):
case Square:
return 4 * g.length
case Circle:
return 2 * PI * g.radius
}
length float
}
type Circle struct {
radius float
}
func Circumference(g Object) float {
switch type(g):
case Square:
return 4 * g.length
case Circle:
return 2 * PI * g.radius
}
Object-Oriented Style
interface GeometricObject {
Circumference() float
}
class Square implements GeometricObject {
length float
constructor(length float) {
this.length = length
}
func Circumference() float {
return 4 * this.length
}
}
class Circle implements GeometricObject {
radius float
constructor(radius float) {
this.radius = radius
}
func Circumference() float {
return 2 * PI * this.radius
}
}
Circumference() float
}
class Square implements GeometricObject {
length float
constructor(length float) {
this.length = length
}
func Circumference() float {
return 4 * this.length
}
}
class Circle implements GeometricObject {
radius float
constructor(radius float) {
this.radius = radius
}
func Circumference() float {
return 2 * PI * this.radius
}
}