---
title: "first(where:)"
framework: swift
role: symbol
role_heading: Instance Method
path: "swift/asyncprefixsequence/first(where:)"
---

# first(where:)

Returns the first element of the sequence that satisfies the given predicate.

## Declaration

```swift
func first(where predicate: (Self.Element) async throws -> Bool) async rethrows -> Self.Element?
```

## Parameters

- `predicate`: A closure that takes an element of the asynchronous sequence as its argument and returns a Boolean value that indicates whether the element is a match.

## Return Value

Return Value The first element of the sequence that satisfies predicate, or nil if there is no element that satisfies predicate.

## Discussion

Discussion In this example, an asynchronous sequence called Counter produces Int values from 1 to 10. The first(where:) method returns the first member of the sequence that’s evenly divisible by both 2 and 3. let divisibleBy2And3 = await Counter(howHigh: 10)     .first { $0 % 2 == 0 && $0 % 3 == 0 } print(divisibleBy2And3 ?? "none") // Prints "6" The predicate executes each time the asynchronous sequence produces an element, until either the predicate finds a match or the sequence ends.