How to find the highest value in an array
Swift version: 5.0
All arrays have a built-in method called max(), which returns the highest item in the array. This comes with a default implementation if the elements of the array conform to Comparable: it will simply compare all items until it finds the one that compares highest.
For example, this code puts 5 into the max constant:
let numbers = [1, 2, 3, 4, 5]
let max = numbers.max()Note: because max() can be called on an empty array, it returns an optional – you need to check and unwrap it yourself.
SPONSOR Tired of wasting time debugging your Swift app? Instabug’s SDK is here to help you minimize your debugging time by providing you with complete device details, network logs, and reproduction steps with every bug report. All data is attached automatically. It only takes a line of code to setup. Get started for free.
Available from iOS 8.0 – learn more in my book Pro Swift
Did this solution work for you? Please pass it on!
Other people are reading…
- What is a lazy sequence?
- What are keypaths?
- What is trailing closure syntax?
- What are class and subtype existentials?
- How to convert a string to a double
About the Swift Knowledge Base
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
