---
title: "next(isolation:)"
framework: swift
role: symbol
role_heading: Instance Method
path: "swift/asyncdropwhilesequence/iterator/next(isolation:)"
---

# next(isolation:)

Produces the next element in the drop-while sequence.

## Declaration

```swift
mutating func next(isolation actor: isolated (any Actor)?) async throws(AsyncDropWhileSequence<Base>.Failure) -> Base.Element?
```

## Discussion

Discussion This iterator calls next(isolation:) on its base iterator and evaluates the result with the predicate closure. As long as the predicate returns true, this method returns nil. After the predicate returns false, for a value received from the base iterator, this method returns that value. After that, the iterator returns values received from its base iterator as-is, and never executes the predicate closure again.