This article has been archived, as it was published several years ago, so some of its information might now be outdated. For more recent articles, please visit the main article feed.
Reducing sequences
Basics article available: Map, FlatMap and CompactMapWhile it's very common in functional programming, the reduce function might be a bit of a hidden gem in Swift. It provides a super useful way to transform a sequence into a single value.
extension Sequence where Element: Equatable {
func numberOfOccurrences(of target: Element) -> Int {
return reduce(0) { result, element in
guard element == target else {
return result
}
return result + 1
}
}
}
Swift by Sundell is brought to you by the Genius Scan SDK — Add a powerful document scanner to any mobile app, and turn scans into high-quality PDFs with one line of code. Try it today.