Removes all the elements that satisfy the given predicate.
SDK
- Xcode 10.0+
Framework
- Swift Standard Library
Declaration
mutating func removeAll(where shouldBeRemoved: (Element) throws -> Bool) rethrows
Parameters
shouldBeRemovedA 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<Character> = ["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.