# EnumeratedSequence An enumeration of the elements of a sequence or collection. ``` @frozen struct EnumeratedSequence where Base : Sequence ``` ## Overview `EnumeratedSequence` is a sequence of pairs (*n*, *x*), where *n*s are consecutive `Int` values starting at zero, and *x*s are the elements of a base sequence. To create an instance of `EnumeratedSequence`, call `enumerated()` on a sequence or collection. The following example enumerates the elements of an array. ``` var s = ["foo", "bar"].enumerated() for (n, x) in s { print("\(n): \(x)") } // Prints "0: foo" // Prints "1: bar" ``` --- 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)