Instance Methodswift 6.1.2_Concurrency

    first(where:)

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

    iOS
    13.0+
    macOS
    10.15+
    tvOS
    13.0+
    watchOS
    6.0+
    func first(where predicate: (Self.Element) async throws -> Bool) async rethrows -> Self.Element?
    Mangled symbol
    sSci12_ConcurrencyE5first5where7ElementQzSgSbAEYaKXE_tYaKF What are these?
    FNV24 hash
    2CLHH

    Parameters

    predicate

    A closure that takes an element of the asynchronous sequence as its argument and returns a Boolean value that indicates whether the element is a match.

    Returns

    The first element of the sequence that satisfies predicate, or nil if there is no element that satisfies predicate.

    In this example, an asynchronous sequence called Counter produces Int values from 1 to 10. The first(where:) method returns the first member of the sequence that’s evenly divisible by both 2 and 3.

    let divisibleBy2And3 = await Counter(howHigh: 10)
    .first { $0 % 2 == 0 && $0 % 3 == 0 }
print(divisibleBy2And3 ?? "none")
// Prints "6"

    The predicate executes each time the asynchronous sequence produces an element, until either the predicate finds a match or the sequence ends.