next()

Declaration

mutating func next() async throws -> Base.Element?

Discussion

This iterator calls next() on its base iterator; if this call returns nil, next() returns nil. Otherwise, next() evaluates the result with the predicate closure. If the closure returns true, next() returns the received element; otherwise it awaits the next element from the base iterator. If calling the closure throws an error, the sequence ends and next() rethrows the error.