# allSatisfy(_:) Returns a Boolean value that indicates whether all elements produced by the asynchronous sequence satisfy the given predicate. ``` func allSatisfy(_ 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 satisfies a condition. ## Return Value `true` if the sequence contains only elements that satisfy `predicate`; otherwise, `false`. ## Discussion In this example, an asynchronous sequence called `Counter` produces `Int` values from `1` to `10`. The `allSatisfy(_:)` method checks to see whether all elements produced by the sequence are less than `10`. ``` let allLessThanTen = await Counter(howHigh: 10) .allSatisfy { $0 < 10 } print(allLessThanTen) // Prints "false" ``` The predicate executes each time the asynchronous sequence produces an element, until either the predicate returns `false` or the sequence ends. If the asynchronous sequence is empty, this method returns `true`. --- 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)