Connections.Digital

Media Production, Mobile Web and iOS Development

Amarillo

Intermediate Swift – Chapter 2.2 Functions

import UIKit

func displayPi() {
    print("3.1415926535")
}

displayPi()

//Parameters

func triple(value: Int) {
    let result = value * 3
    print("If you multiply \(value) by 3, you'll get \(result).")
}

triple(value: 10)

func multiply(firstNumber: Int, secondNumber: Int) {
    let result = firstNumber * secondNumber
    print("The result is \(result).")
}

multiply(firstNumber: 7, secondNumber: 8)

//Argument Labels

func sayHello(to firstPerson: String, and SecondPerson: String) {
    print("Hello, \(firstPerson) and \(SecondPerson).")
}

sayHello(to: "Jancy", and: "Yvonne")

//Default Parameters

func display(teamName: String, score: Int = 0) {
    print("\(teamName): \(score)")
}

display(teamName: "Wombats", score: 100)
display(teamName: "Warriors")

//Return Values

func multiply1(firstNumber: Int, secondNumber: Int) -> Int {
    let result = firstNumber * secondNumber
    return result
}

print(multiply1(firstNumber: 7, secondNumber: 8))

let myResult = multiply1(firstNumber: 5, secondNumber: 5)

print("5 * 5 is \(myResult)")

print("5 * 2 is \(multiply1(firstNumber: 5, secondNumber: 2))")

Intermediate Swift – Chapter 2.1 Strings

import UIKit

let joke = """
    Q: Why did the chicken cross the road?
    A: To get to the other side!
    """

print(joke)

let greeting = "It is traditional in programming to print \"Hello World\"."

print(greeting)

var myString = ""

if myString.isEmpty {
    print("The string is empty.")
}

myString

let string1 = "Hello"
let string2 = ", world!"
let myString1 = string1 + string2

print(myString1)

var myString2 = "Hello"
myString2 = myString2 + ", world!"
myString2 += " Hello!"

print(myString2)


//String Interpolation

let name = "Kenneth"
let age = 53
print("\(name) is \(age) years old.") // Kenneth is 53 years old.

let a = 4
let b = 5
print("If a is \(a) and b is \(b), then a + b equals \(a+b)")

//String Equality and Comparison

let month = "January"
let otheMonth = "January"

let lowercasedMonth = "january"

if month == otheMonth {
    print("They are he same")
}

if month != lowercasedMonth {
    print("They are not the same.")
}

let name1 = "Johnny Appleseed"
if name1.lowercased() == "joHnny aPPleseeD".lowercased() {
    print("The two names are equal.")
}

let greeting1 = "Hello, world!"

print(greeting1.hasPrefix("Hello"))
print(greeting1.hasSuffix("world!"))
print(greeting1.hasSuffix("World!"))

let greeting2 = "Hi Jancy, my name is Kenneth."

    if greeting2.contains("my name is") {
        
        print("Making an introduction")
}

//Counting characters
let count = name.count
print(count)

let newPassword = "1234"

if newPassword.count < 8 {
    print("The password is too short. Passwords must have at least 8 characters.")
}

//Switch Statements

let someCharacter: Character = "e"
switch someCharacter {
case "a", "e", "i", "o", "u":
    print("\(someCharacter) is a vowel")
default:
    print("\(someCharacter) is not a vowel")
}