How to use one-sided ranges
Swift version: 5.1
One-sided ranges allow us to skip either the start or end of a range to have Swift infer the starting point for us. As an example, consider this array:
let characters = ["Dr Horrible", "Captain Hammer", "Penny", "Bad Horse", "Moist"]If we wanted to read only the first three items from that array, we could use characters[..<3] – we skipped the start point, so Swift will automatically infer the start of the array:
let bigParts = characters[..<3]That will create an array containing ["Dr Horrible", "Captain Hammer", "Penny"].
Similarly, we could skip the end of the range to have Swift infer the end of the array, like this:
let smallParts = characters[3...]That will create an array containing ["Bad Horse", "Moist"].
SPONSORED Catch bugs as soon as they happen and know exactly why a crash occurred by integrating Instabug's SDK in one minute. You will automatically receive device data, network logs, and reproduction steps with every bug and crash report.
Sponsor Hacking with Swift and reach the world's largest Swift community!
Available from iOS 8.0
Similar solutions…
- SwiftUI tips and tricks
- Building a menu using List
- How to create live playgrounds in Xcode
- What’s the difference between @ObservedObject, @State, and @EnvironmentObject?
- How to create a random terrain tile map using SKTileMapNode and GKPerlinNoiseSource
About the Swift Knowledge Base
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
