# removeAll(where:) Removes all the elements that satisfy the given predicate. ``` mutating func removeAll(where shouldBeRemoved: (Self.Element) throws -> Bool) rethrows ``` ## Parameters `shouldBeRemoved` A closure that takes an element of the sequence as its argument and returns a Boolean value indicating whether the element should be removed from the collection. ## Discussion Use this method to remove every element in a collection that meets particular criteria. The order of the remaining elements is preserved. This example removes all the vowels from a string: ``` var phrase = "The rain in Spain stays mainly in the plain." let vowels: Set = ["a", "e", "i", "o", "u"] phrase.removeAll(where: { vowels.contains($0) }) // phrase == "Th rn n Spn stys mnly n th pln." ``` > Complexity: O(*n*), where *n* is the length of the collection. --- 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)