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

# contains(where:)

Returns a Boolean value that indicates whether the asynchronous sequence contains an element that satisfies the given predicate.

## Declaration

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

## Parameters

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

## Return Value

Return Value true if the sequence contains an element that satisfies predicate; otherwise, false.

## Discussion

Discussion You can use the predicate to check for an element of a type that doesn’t conform to the Equatable protocol, or to find an element that satisfies a general condition. In this example, an asynchronous sequence called Counter produces Int values from 1 to 10. The contains(where:) method checks to see whether the sequence produces a value divisible by 3: let containsDivisibleByThree = await Counter(howHigh: 10)     .contains { $0 % 3 == 0 } print(containsDivisibleByThree) // Prints "true" The predicate executes each time the asynchronous sequence produces an element, until either the predicate finds a match or the sequence ends.