Notice: Undefined index: understanding-swift in /var/sites/hackingwithswift.com/site/src/Controller/NewBooksReadController.php on line 89
Why would you want to exit a loop? - a free tutorial

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

Why would you want to exit a loop?

Paul Hudson    @twostraws   

Swift’s break keyword lets us exit a loop immediately, regardless of what kind of loop we’re talking about. A lot of the time you won’t need this, because you’re looping over items in an array and want to process them all, or because you’re counting from 1 through 10 and want to handle all those values.

However, sometimes you do want to end your loop prematurely. For example, if you had an array of scores and you want to figure out how many of them the player achieved without getting a 0, you might write this:

let scores = [1, 8, 4, 3, 0, 5, 2]
var count = 0

for score in scores {
    if score == 0 {
        break
    }

    count += 1
}

print("You had \(count) scores before you got 0.")

Without break we’d need to continue looping through scores even after we found the first 0, which is wasteful.

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!

Link copied to your pasteboard.