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iOS Generics in Swift Generics and Protocols Extending Generic Types

Ingo Ngoyama
Ingo Ngoyama
4,882 Points
Posted by Ingo Ngoyama
Ingo Ngoyama
4,882 Points

no code snippet

code snippet is missing

1 Answer

Xavier D
PLUS
Xavier D
Courses Plus Student 5,840 Points
Xavier D
Xavier D
Courses Plus Student 5,840 Points 
import Foundation

struct Weather
{
    let temperature: Double, humidity: Double, chanceOfRain: Double,

        icon: String,

        highTemperature: Double, lowTemperature: Double,

        sunrise: Date, sunset: Date
}

let current = Weather(temperature: 63, humidity: 0.36, chanceOfRain: 0.04,

                      icon: "Cloudy",

                      highTemperature: 67, lowTemperature: 50,

                      sunrise: Date(), sunset: Date())

print(current)

protocol PrettyPrintable { var prettyDescription: String { get } }

extension Weather: PrettyPrintable
{
    var prettyDescription: String
    {                                                                                                                   return
        "Temperature: \(temperature)\nHumidity: \(humidity)\nChance of Rain: \(chanceOfRain)\nIcon: \(icon)\nHigh Temperature: \(highTemperature)\nLow Temperature: \(lowTemperature)\nSunrise time: \(sunrise)\nSunset time: \(sunset)"
    }
}

print(current.prettyDescription)

let tuesday = Weather(temperature: 63, humidity: 0.36, chanceOfRain: 0.04,

                      icon: "Cloudy",

                      highTemperature: 67, lowTemperature: 50,

                      sunrise: Date(), sunset: Date())
let wednesday = Weather(temperature: 63, humidity: 0.36, chanceOfRain: 0.04,

                      icon: "Cloudy",

                      highTemperature: 67, lowTemperature: 50,

                      sunrise: Date(), sunset: Date())
let thursday = Weather(temperature: 63, humidity: 0.36, chanceOfRain: 0.04,

                      icon: "Cloudy",

                      highTemperature: 67, lowTemperature: 50,

                      sunrise: Date(), sunset: Date())

let week =
            [
                current,

                tuesday,
                wednesday,
                thursday
            ]

for day in week {print(day.prettyDescription)}

//extension Array where Element: PrettyPrintable
//{
//    var prettyDescription: String
//    {var
//                                                    output = ""
//        for (index, element) in self.enumerated(){  output += "\n\n*********\n\nIndex:\(index)\n\n\(element.prettyDescription)"}
//                                            return  output
//    }
//}
//print(week.prettyDescription)

let array = [1,2]

extension Sequence where Iterator.Element == Weather
{
        var prettyDescription: String
{       var
                                                    output = ""
        for (index, element) in self.enumerated(){  output += "\n\n*********\n\nIndex:\(index)\n\n\(element.prettyDescription)"}
                                            return  output
}
}

print(week.prettyDescription)

dump(current)
```swift