Swift — If Else

Basic if

let temperature = 28

if temperature > 25 {
    print("It's warm!")
}

if-else

let hour = 14

if hour < 12 {
    print("Good morning!")
} else {
    print("Good afternoon!")
}

if-else if-else

let score = 85

if score >= 90 {
    print("Grade: A")
} else if score >= 80 {
    print("Grade: B")
} else if score >= 70 {
    print("Grade: C")
} else {
    print("Grade: F")
}

switch statement

let day = 3

switch day {
case 1:
    print("Monday")
case 2:
    print("Tuesday")
case 3:
    print("Wednesday")
case 6, 7:
    print("Weekend!")
default:
    print("Invalid day")
}

switch with patterns

let value = 42

switch value {
case 0:
    print("Zero")
case 1...9:
    print("Single digit")
case 10...99:
    print("Double digit")
default:
    print("Large number")
}

// Tuple matching
let point = (1, 1)

switch point {
case (0, 0):
    print("Origin")
case (_, 0):
    print("On x-axis")
case (0, _):
    print("On y-axis")
case (-2...2, -2...2):
    print("Inside 2x2 box")
default:
    print("Outside")
}

guard statement

func process(name: String?) {
    guard let name = name else {
        print("No name")
        return
    }
    print("Processing: \(name)")
}

process(name: "Alice") // Processing: Alice
process(name: nil)     // No name

Combining conditions

let age = 25
let income = 50000

if age >= 18 && income >= 30000 {
    print("Qualifies for premium")
}

if age < 12 || age > 65 {
    print("Discounted ticket")
}

Mini Practice

Write Swift code that:

1. Uses switch with ranges
2. Pattern matches a tuple
3. Uses guard for early return
4. Combines conditions with && and ||

Up Next

In the next lesson, you'll learn about Switch — Swift's powerful switch statement.