NEW: Subscribe to Hacking with Swift+ and accelerate your learning! >>

Range operators

Swift gives us two ways of making ranges: the ..< and ... operators. The half-open range operator, ..<, creates ranges up to but excluding the final value, and the closed range operator, ..., creates ranges up to and including the final value.

For example, the range 1..<5 contains the numbers 1, 2, 3, and 4, whereas the range 1...5 contains the numbers 1, 2, 3, 4, and 5.

Ranges are helpful with switch blocks, because you can use them for each of your cases. For example, if someone sat an exam we could print different messages depending on their score:

let score = 85

switch score {
case 0..<50:
    print("You failed badly.")
case 50..<85:
    print("You did OK.")
default:
    print("You did great!")
}

As before, the default case must be there to ensure all possible values are covered.

Hacking with Swift is sponsored by Instabug

SPONSORED Are you tired of wasting time debugging your Swift app? Instabug’s SDK is here to help you minimize debugging time by providing you with complete device details, network logs, and reproduction steps with every bug report. All data is attached automatically, and it only takes a line of code to setup. Start your free trial now and get 3 months off exclusively for the Hacking with Swift Community.

Start your free trial!

Sponsor Hacking with Swift and reach the world's largest Swift community!

BUY OUR BOOKS
Buy Pro Swift Buy Swift Design Patterns Buy Testing Swift Buy Hacking with iOS Buy Swift Coding Challenges Buy Swift on Sundays Volume One Buy Server-Side Swift (Vapor Edition) Buy Advanced iOS Volume One Buy Advanced iOS Volume Two Buy Advanced iOS Volume Three Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with macOS Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Server-Side Swift (Kitura Edition) Buy Beyond Code

Was this page useful? Let us know!

Average rating: 5.0/5

Link copied to your pasteboard.