# allSatisfy(_:) Returns a Boolean value indicating whether every element of a sequence satisfies a given predicate. ``` func allSatisfy(_ predicate: (Self.Element) throws -> Bool) rethrows -> Bool ``` ## Parameters `predicate` A closure that takes an element of the 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 The following code uses this method to test whether all the names in an array have at least five characters: ``` let names = ["Sofia", "Camilla", "Martina", "Mateo", "Nicolás"] let allHaveAtLeastFive = names.allSatisfy({ $0.count >= 5 }) // allHaveAtLeastFive == true ``` If the sequence is empty, this method returns `true`. > Complexity: O(*n*), where *n* is the length of the sequence. --- 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)