# zip(_:_:) Creates a sequence of pairs built out of two underlying sequences. ``` func zip(_ sequence1: Sequence1, _ sequence2: Sequence2) -> Zip2Sequence where Sequence1 : Sequence, Sequence2 : Sequence ``` ## Parameters `sequence1` The first sequence or collection to zip. `sequence2` The second sequence or collection to zip. ## Return Value A sequence of tuple pairs, where the elements of each pair are corresponding elements of `sequence1` and `sequence2`. ## Discussion In the `Zip2Sequence` instance returned by this function, the elements of the *i*th pair are the *i*th elements of each underlying sequence. The following example uses the `zip(_:_:)` function to iterate over an array of strings and a countable range at the same time: ``` let words = ["one", "two", "three", "four"] let numbers = 1...4 for (word, number) in zip(words, numbers) { print("\(word): \(number)") } // Prints "one: 1" // Prints "two: 2" // Prints "three: 3" // Prints "four: 4" ``` If the two sequences passed to `zip(_:_:)` are different lengths, the resulting sequence is the same length as the shorter sequence. In this example, the resulting array is the same length as `words`: ``` let naturalNumbers = 1...Int.max let zipped = Array(zip(words, naturalNumbers)) // zipped == [("one", 1), ("two", 2), ("three", 3), ("four", 4)] ``` --- 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)