# contains(where:) Returns a Boolean value that indicates whether the asynchronous sequence contains an element that satisfies the given predicate. ``` 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 `true` if the sequence contains an element that satisfies predicate; otherwise, `false`. ## 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. --- 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)