Instance Method

allSatisfy(_:)

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

Declaration

func allSatisfy(_ predicate: ((key: Key, value: Value)) 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(where: ((key: Key, value: Value)) -> Bool) -> Bool

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

func first(where: ((key: Key, value: Value)) -> Bool) -> (key: Key, value: Value)?

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

func firstIndex(where: ((key: Key, value: Value)) -> Bool) -> Index?

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

func min(by: ((key: Key, value: Value), (key: Key, value: Value)) -> Bool) -> (key: Key, value: Value)?

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

func max(by: ((key: Key, value: Value), (key: Key, value: Value)) -> Bool) -> (key: Key, value: Value)?

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