Sorting an array of structs on a single property

sorting an array of structs on a single property.swift

struct City {
    var name: String
    var rainyDays: Int
    var rainTotal: Double
}
var cities: [City] = []
cities.append(City(name: "Seattle", rainyDays: 149, rainTotal: 37.7))
cities.append(City(name: "Phoenix", rainyDays: 30, rainTotal: 8.2))
cities.append(City(name: "Chicago", rainyDays: 124, rainTotal: 36.9))
cities.append(City(name: "Boston", rainyDays: 126, rainTotal: 43.8))
cities.append(City(name: "Atlanta", rainyDays: 113, rainTotal: 49.7))
cities.append(City(name: "Austin", rainyDays: 88, rainTotal: 34.2))

// Note: the forEach method will print out each element in the array. You'll learn more about this in a later chapter
cities.sort(by: {$0.name < $1.name}) // Alphabetical
cities.forEach({print("\($0.name), \($0.rainyDays), \($0.rainTotal)")})
print("")

cities.sort(by: {$0.rainyDays > $1.rainyDays}) // Most rainy days
cities.forEach({print("\($0.name), \($0.rainyDays), \($0.rainTotal)")})
print("")

cities.sort(by: {$0.rainTotal < $1.rainTotal}) // Driest
cities.forEach({print("\($0.name), \($0.rainyDays), \($0.rainTotal)")})
print("")