Set your Publisher ID in src/config/ads.ts to display live ads.
Swift Introduction & The Apple Ecosystem
Fast, modern, type-safe language designed by Apple for native apps
Introduced by Apple in 2014 to replace Objective-C, Swift is a powerful, open-source, compiled language designed for maximum performance, safety, and developer ergonomics.
Key Features of Swift
let (Constant) vs var (Variable): Swift strongly encourages immutability (let) by default to prevent unexpected side effects.
Type Inference: You rarely need to write explicit types; Swift infers types automatically from initial values.
String Interpolation: Embed expressions inside strings using \(expression).
// let creates an immutable constant; var creates a mutable variable
let appTitle = "Codexia iOS Mastery"
var studentCount = 3500
// String interpolation with \()
print("Welcome to \(appTitle)! Enrolled students: \(studentCount)")
studentCount += 1
print("New student enrolled. Total: \(studentCount)")Set your Publisher ID in src/config/ads.ts to display live ads.
Test Yourself With Exercise
Which keyword in Swift is used to declare an immutable constant whose value cannot change after initialization?