---
title: "zip(_:_:)"
framework: swift
role: symbol
role_heading: Function
path: "swift/zip(_:_:)"
---

# zip(_:_:)

Creates a sequence of pairs built out of two underlying sequences.

## Declaration

```swift
func zip<Sequence1, Sequence2>(_ sequence1: Sequence1, _ sequence2: Sequence2) -> Zip2Sequence<Sequence1, Sequence2> where Sequence1 : Sequence, Sequence2 : Sequence
```

## Parameters

- `sequence1`: The first sequence or collection to zip.
- `sequence2`: The second sequence or collection to zip.

## Return Value

Return Value A sequence of tuple pairs, where the elements of each pair are corresponding elements of sequence1 and sequence2.

## Discussion

Discussion In the Zip2Sequence instance returned by this function, the elements of the ith pair are the ith 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)]