Instance Method

allSatisfy(_:)

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

Declaration

func allSatisfy(_ predicate: (Bound) throws -> Bool) rethrows -> Bool
Available when Bound conforms to Strideable and Bound.Stride conforms to SignedInteger.

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

Checking for Containment

func contains(Bound) -> Bool

Returns a Boolean value indicating whether the given element is contained within the range.

func contains(where: (Bound) -> Bool) -> Bool

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

static func ~= (Range<Bound>, Bound) -> Bool

Returns a Boolean value indicating whether a value is included in a range.