Ceri-anne

import Foundation

struct User: Decodable {
    var firstName: String
    var lastName: String
    var pets: [Pet]
    
    struct Pet: Decodable {
        var species: String
        var breed: String

Ceri-anne

func run() {

    let arguments = CommandLine.arguments

    if arguments.count > 1 {

        let greeting = arguments[1]

        print(greeting)

Ceri-anne

import Foundation

func run() {

let arguments = CommandLine.arguments

print(arguments)

print("Hello, World! This is my command line tool")

Ceri-anne

import Foundation

print(“Hello, World! This is my command line tool”)

Ceri-anne

let midfielders = ["Barnes", "McManaman", nil, nil, "Gerrard"]

let midField = midfielders.compactMap { $0?.uppercased() }

print(midField)

Ceri-anne

let playersUpper = players.flatMap{ $0.map { $0.uppercased() } } 

print(playersUpper)  
// Returns ["OWEN", "FOWLER", "RUSH", "BARNES", "MCMANAMAN", "GERRARD", "CARRAGER", "THOMPSON", "NICOL"]

Ceri-anne

let allPlayers = players.flatMap{ $0.uppercased() }      

Ceri-anne

let forwards = ["Owen", "Fowler", "Rush"]
let midfielders = ["Barnes", "McManaman", "Gerrard"]
let defenders = ["Carrager", "Thompson", "Nicol"]

let players = [forwards, midfielders, defenders]

let allPlayers = players.flatMap { $0 }

print(allPlayers)  // returns ["Owen", "Fowler", "Rush", "Barnes", "McManaman", "Gerrard", "Carrager", "Thompson", "Nicol"]

Ceri-anne

let numbers = [1,2,3,4,5,6,7,8,9,10]

let evenNumbers = numbers.compactMap { $0 % 2 == 0 ? $0 : nil }

print(evenNumbers)        //returns [2,4,6,8,10]

Ceri-anne

let players = ["Gerrard", "Dalglish", "Barnes"]

var playersUppercased = [String]()

for player in players {
    playersUppercased.append(player.uppercased())
}

print(playersUppercased)  // returns ["GERRARD", "DALGLISH", "BARNES"]