Swift version: 5.6
The firstIndex(of:)
method tells you the index of an element in an array if it exists, or returns nil otherwise. Because it's an optional value, you need to unwrap it carefully or at least check the result, like this:
let array = ["Apples", "Peaches", "Plums"]
if let index = array.firstIndex(of: "Peaches") {
print("Found peaches at index \(index)")
}
Note: in earlier versions of Swift this method was called index(of:)
.
SPONSORED Still waiting on your CI build? Speed it up ~3x with Blaze - change one line, pay less, keep your existing GitHub workflows. First 25 HWS readers to use code HACKING at checkout get 50% off the first year. Try it now for free!
Sponsor Hacking with Swift and reach the world's largest Swift community!
Available from iOS 7.0
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
Link copied to your pasteboard.