Programming in Swift: Functions & Types
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Notes: 44. Challenge: Protocols
Update Notes: This course was originally recorded in 2019. It has been reviewed and all content and materials updated as of October 2021.
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This is your final challenge for the course. You’ll find instructions in the playground for this part of the course. Pause the video, and give it a try. Then, come back to see my solutions. Good luck!
protocol Shape {
}
var area: Double { get }
struct Square: Shape {
let side: Double
var area: Double {
side * side
}
}
extension Numeric {
var squared: Self { self * self }
}
side.squared
struct Triangle: Shape {
}
let base: Double
let height: Double
var area: Double {
0.5 * base * height
}
struct Circle: Shape {
}
let radius: Double
var area: Double {
}
.pi * radius.squared
let square = Square(side: 4)
let triangle = Triangle(base: 3, height: 5)
let circle = Circle(radius: 2)
let shapes: [Shape] = [square, triangle, circle]
print(shapes.map { $0.area })
extension FloatingPoint {
}
var isInteger: Bool {
}
rounded() == self
let double: Double = 5.0
let float: Float = 3.7
double.isInteger
float.isInteger