5-Day Swift Coding Challenge: Day 1

Sep 15 2025 · Swift 6.0, iOS 18, Swift Playground 4.6

Lesson 01: Day 1: Meet the Swift Programming Language

Demo: Variables in Action

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To get started, open up your Swift Playgrounds app. You’ll be presented with a few options to create a new playground. If you are on an iPad, tap the New Playground option and select the New Book option. On macOS, at the time, we don’t have access to create a new book. Instead, we need to do this from the menubar. Select File and the New Book option.

var greeting = "Hello World!"

print(greeting)

print(greet)

print(greeting)

print("🟢")
print("🟡")
print("🔴")

print("🟧🟧🟧")
print("🟧🔴🟧")
print("🟧🟡🟧")
print("🟧🟢🟧")
print("🟧🟧🟧")

var firstName = "Brian"

greeting = "Hello \(firstName)"
print(greeting)

greeting = "Hello \(1000 * -20)"

let lastName = "Moakley"
print("Hello \(firstName) \(lastName)")

lastName = "Einstein"

var number = 10
var decimal = 10.4
var trueOrFalse = true
var emoji = "🐰"

var number: Int = 10
var decimal: Double = 10.4
var trueOrFalse: Bool = true
var emoji: Character = "🐰"

var text: String = "Learning Swift rocks!"

let myInt = 10
let myDouble = 20.0
let myTotal = myInt + myDouble

let myTotal = myInt + Int(myDouble)
print(myTotal)

let myTotal = Double(myInt) + myDouble
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