SALE: Save 50% on all my books and bundles >>

How to use the forEach method to loop over an array

Swift version: 5.1

Paul Hudson    @twostraws   

In Swift we normally loop over arrays like this:

let numbers = [1, 2, 3, 4, 5]

for number in numbers {
    print(number)
}

However, Swift provides us an alternative: a dedicated array method called forEach(), that loops over each item in the array and does something with it. For example, the above loop would be written like this:

numbers.forEach {
    print($0)
}

The difference is that forEach() can’t skip over any items – you can’t exit the loop part way, without processing the rest of the items. This helps people reading your code to figure out your intent: you want to act on all items, and won’t stop in the middle.

Hacking with Swift is sponsored by RevenueCat

SPONSORED Building in-app subscriptions are hard. RevenueCat makes it simple. With their open source SDKs, you can painlessly implement subscriptions for your app in hours, not months.

Explore the docs to learn more

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

Snapthread is a casual video editor and slideshow maker that makes discovering, compiling and sharing your favorite memories effortless.

Available from iOS 8.0 – learn more in my book Pro Swift

Similar solutions…

About the Swift Knowledge Base

This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.

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