# lastIndex(of:) Returns the last index where the specified value appears in the collection. ``` func lastIndex(of element: Self.Element) -> Self.Index? ``` ## Parameters `element` An element to search for in the collection. ## Return Value The last index where `element` is found. If `element` is not found in the collection, this method returns `nil`. ## Discussion After using `lastIndex(of:)` to find the position of the last instance of a particular element in a collection, you can use it to access the element by subscripting. This example shows how you can modify one of the names in an array of students. ``` var students = ["Ben", "Ivy", "Jordell", "Ben", "Maxime"] if let i = students.lastIndex(of: "Ben") { students[i] = "Benjamin" } print(students) // Prints "["Ben", "Ivy", "Jordell", "Benjamin", "Max"]" ``` > Complexity: O(*n*), where *n* is the length of the collection. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)