Switch With Ranges

Switch statements become even more powerful when you use ranges instead of individual values. This is perfect for categorizing numbers into groups, like converting a score into a grade.

let score = 85

switch score {
case 90...100:
    print("A")
case 80..<90:
    print("B")
case 70..<80:
    print("C")
case 60..<70:
    print("D")
default:
    print("F")
}

The ... operator creates a closed range that includes both endpoints, so 90...100 matches 90, 91, all the way through 100. The ..< operator creates a half-open range that excludes the upper bound — 80..<90 matches 80 through 89.

Swift checks each case in order and executes the first matching one. Since our score is 85, it falls within 80..<90, so "B" gets printed. This approach is much cleaner than writing multiple else if conditions with comparison operators.