Notice: Undefined index: understanding-swift in /var/sites/hackingwithswift.com/site/src/Controller/NewBooksReadController.php on line 89
Why does Swift need multi-line strings? - a free tutorial

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

Why does Swift need multi-line strings?

Paul Hudson    @twostraws   

Swift’s standard strings start and end with quotes, but must never contain any line breaks. For example, this is a standard string:

var quote = "Change the world by being yourself"

That works fine for small pieces of text, but becomes ugly in source code if you have lots of text you want to store. That’s where multi-line strings come in: if you use triple quotes you can write your strings across as many lines as you need, which means the text remains easy to read in your code:

var burns = """
The best laid schemes
O’ mice and men
Gang aft agley
"""

Swift sees those line breaks in your string as being part of the text itself, so that string actually contains three lines.

Tip: Sometimes you will want to have long strings of text in your code without using multiple lines, but this is quite rare. Specifically, this is most commonly important if you plan to share your code with others – if they see an error message in your program they might want to search your code for it, and if you’ve split it across multiple lines their search might fail.

Hacking with Swift is sponsored by NSSpain

SPONSORED Announcing NSSpain 2020: Remote Edition! An online, continuous conference for iOS developers. We’ll start on Thursday and finish on Friday, with talks, activities, and lots of fun for 36 hours, non-stop. Sound good? Join us!

Find out more

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.