NEW! Master Swift design patterns with my latest book! >>

< Previous: Switch statements   Next: Operators and conditions summary >

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.

Master iOS 11 now!

My book Practical iOS 11 gives you seven complete coding projects that teach all the major new features in iOS 11 in a smart, practical way.

< Previous: Switch statements   Next: Operators and conditions summary >
MASTER SWIFT NOW
Buy Practical iOS 12 Buy Pro Swift Buy Swift Design Patterns Buy Practical iOS 11 Buy Swift Coding Challenges Buy Server-Side Swift (Vapor Edition) Buy Server-Side Swift (Kitura Edition) Buy Hacking with macOS Buy Advanced iOS Volume One Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with Swift Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Beyond Code

Was this page useful? Let me know!

Click here to visit the Hacking with Swift store >>