Playing around with Swift. http://johnotander.com/swift/2014/06/04/an-introduction-to-the-swift-programming-language-part-one/

playing_with_swift.swift

// Playground - noun: a place where people can play

import Cocoa

var str = "Hello, playground"

var myConstant = "This is an immutable string"
myConstant = "Can't do this"

var favoriteNumberDescr = "My favorite number is "
var favoriteNumber = 7
"My favorite number is \(favoriteNumber)"

let arrayOne = String[]()
let arrayTwo = []

let dictionaryOne = Dictionary<String, Float>()
let dictionaryTwo = [:]

func printStr(strToPrint: String) {
    println(strToPrint)
}

func getHelloStr(helloRecipient: String) -> String {
    return "Hello, \(helloRecipient)"
}

func makeIsOneCheck() -> (Int -> Bool) {
    func isOne(val: Int) -> Bool {
        return val == 1
    }
    return isOne
}

func divideByTwo(number: Int) -> Int {
    return number/2
}

var isOneCheck = makeIsOneCheck()
isOneCheck(1)
isOneCheck(7)

let numbers = [1, 4, 8, 234, 12]

numbers.map(divideByTwo)

[1, 4, 8, 234, 12].map({
    (number: Int) -> Int in
    return number / 2
})

[1, 4, 8, 234, 12].map({ number in number/2 })

class User {
    var username: String = ""
    var email: String = ""
    var favoriteFood: String = ""
    var favoriteNumber: Int
    
    init(email: String, favoriteNumber: Int) {
        self.email = email
        self.favoriteNumber = favoriteNumber
    }
    
    func description() -> String {
        return "\(username) with email \(email) who likes the number \(favoriteNumber) and eating \(favoriteFood)"
    }
    
    func isAdmin() -> Bool {
        return false
    }
}

let u = User(email: "[email protected]", favoriteNumber: 7)
u.email
u.description()

class Admin: User {
    var role: String {
    willSet {
        priorRoles.append(self.role)
    }
    }
    var priorRoles: String []
    
    init(email: String, favoriteNumber: Int, role: String) {
        self.role = role
        self.priorRoles = []
        super.init(email: email, favoriteNumber: favoriteNumber)
    }
    
    override func isAdmin() -> Bool {
        return true
    }
}

let admin = Admin(email: "[email protected]", favoriteNumber: 7, role: "posts")

admin.role
admin.priorRoles
admin.role = "New Role"
admin.priorRoles
admin.isAdmin()

let immutableArray = ["1", "2", "3"]

func omgWtf(array: String[]) {
    var copy = array
    copy[0] = "omg"
    copy[1] = "wtf"
}

omgWtf(immutableArray)
immutableArray // ["omg", "wtf", "3"]