Returns the first element of the sequence that satisfies the given predicate.
- Xcode 9.0+
- Swift Standard Library
A closure that takes an element of the sequence as its argument and returns a Boolean value indicating whether the element is a match.
The first element of the sequence that satisfies
nil if there is no element that satisfies
The following example uses the
first(where:) method to find the first negative number in an array of integers:
Complexity: O(n), where n is the length of the sequence.