# subscript(_:) Accesses the element at the specified position. ``` subscript(i: DiscontiguousSlice.Index) -> Base.Element { get set } ``` ## Parameters `i` The position of the element to access. `i` must be a valid index of the collection that is not equal to the `endIndex` property. ## Overview For example, you can replace an element of an array by using its subscript. ``` var streets = ["Adams", "Bryant", "Channing", "Douglas", "Evarts"] streets[1] = "Butler" print(streets[1]) // Prints "Butler" ``` You can subscript a collection with any valid index other than the collection’s end index. The end index refers to the position one past the last element of a collection, so it doesn’t correspond with an element. > Complexity: O(1) --- 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)