Instance Method

allSatisfy(_:)

Returns a Boolean value indicating whether every element of a sequence satisfies a given predicate.

Declaration

func allSatisfy(_ predicate: (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

Complexity: O(n), where n is the length of the sequence.

See Also

Finding Elements

func contains(Element) -> Bool

Returns a Boolean value indicating whether the sequence contains the given element.

Available when Element conforms to Equatable.
func contains(where: (Element) -> Bool) -> Bool

Returns a Boolean value indicating whether the sequence contains an element that satisfies the given predicate.

func first(where: (Element) -> Bool) -> Element?

Returns the first element of the sequence that satisfies the given predicate.

func firstIndex(of: Element) -> Int?

Returns the first index where the specified value appears in the collection.

Available when Element conforms to Equatable.
func index(of: Element) -> Int?

Returns the first index where the specified value appears in the collection.

Available when Element conforms to Equatable.
Deprecated
func firstIndex(where: (Element) -> Bool) -> Int?

Returns the first index in which an element of the collection satisfies the given predicate.

func last(where: (Element) -> Bool) -> Element?

Returns the last element of the sequence that satisfies the given predicate.

func lastIndex(of: Element) -> Int?

Returns the last index where the specified value appears in the collection.

Available when Element conforms to Equatable.
func lastIndex(where: (Element) -> Bool) -> Int?

Returns the index of the last element in the collection that matches the given predicate.

func min() -> Element?

Returns the minimum element in the sequence.

Available when Element conforms to Comparable.
func min(by: (Element, Element) -> Bool) -> Element?

Returns the minimum element in the sequence, using the given predicate as the comparison between elements.

func max() -> Element?

Returns the maximum element in the sequence.

Available when Element conforms to Comparable.
func max(by: (Element, Element) -> Bool) -> Element?

Returns the maximum element in the sequence, using the given predicate as the comparison between elements.