I modified Town.swift
to satisfy the challenge requirement.
//
// Town.swift
// MonsterTown
//
import Foundation
struct Town {
static let world = "Earth"
let region = "Middle"
var population = 5_422 {
didSet(oldPopulation) {
if population <= oldPopulation {
print("The population has changed to \(population) from \(oldPopulation).")
}
}
}
var numberOfStoplights = 4
enum Size {
case small
case medium
case large
}
var townSize: Size {
switch population {
case 0...10_000:
return Size.small
case 10_001...100_000:
return Size.medium
default:
return Size.large
}
}
func printDescription() {
print("Populations: \(population); number of stoplights: \(numberOfStoplights)")
}
mutating func changePopulation(by amount: Int) {
population += amount
}
}