# enumerated() Returns a sequence of pairs (*n*, *x*), where *n* represents a consecutive integer starting at zero and *x* represents an element of the sequence. ``` func enumerated() -> EnumeratedSequence ``` ## Return Value A sequence of pairs enumerating the sequence. ## Discussion This example enumerates the characters of the string “Swift” and prints each character along with its place in the string. ``` for (n, c) in "Swift".enumerated() { print("\(n): '\(c)'") } // Prints "0: 'S'" // Prints "1: 'w'" // Prints "2: 'i'" // Prints "3: 'f'" // Prints "4: 't'" ``` When you enumerate a collection, the integer part of each pair is a counter for the enumeration, but is not necessarily the index of the paired value. These counters can be used as indices only in instances of zero-based, integer-indexed collections, such as `Array` and `ContiguousArray`. For other collections the counters may be out of range or of the wrong type to use as an index. To iterate over the elements of a collection with its indices, use the `zip(_:_:)` function. This example iterates over the indices and elements of a set, building a list consisting of indices of names with five or fewer letters. ``` let names: Set = ["Sofia", "Camilla", "Martina", "Mateo", "Nicolás"] var shorterIndices: [Set.Index] = [] for (i, name) in zip(names.indices, names) { if name.count <= 5 { shorterIndices.append(i) } } ``` Now that the `shorterIndices` array holds the indices of the shorter names in the `names` set, you can use those indices to access elements in the set. ``` for i in shorterIndices { print(names[i]) } // Prints "Sofia" // Prints "Mateo" ``` > 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)