Returns a Boolean value indicating whether every element of a sequence satisfies a given predicate.
SDK
- Xcode 10.0+
Framework
- Swift Standard Library
Declaration
Parameters
predicateA 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.