---
title: "drop(while:)"
framework: swift
role: symbol
role_heading: Instance Method
path: "swift/asyncsequence/drop(while:)-9sp3b"
---

# drop(while:)

Omits elements from the base asynchronous sequence until a given closure returns false, after which it passes through all remaining elements.

## Declaration

```swift
@preconcurrency func drop(while predicate: @escaping @Sendable (Self.Element) async -> Bool) -> AsyncDropWhileSequence<Self>
```

## Parameters

- `predicate`: A closure that takes an element as a parameter and returns a Boolean value indicating whether to drop the element from the modified sequence.

## Return Value

Return Value An asynchronous sequence that skips over values from the base sequence until the provided closure returns false.

## Discussion

Discussion Use drop(while:) to omit elements from an asynchronous sequence until the element received meets a condition you specify. In this example, an asynchronous sequence called Counter produces Int values from 1 to 10. The drop(while:) method causes the modified sequence to ignore received values until it encounters one that is divisible by 3: let stream = Counter(howHigh: 10)     .drop { $0 % 3 != 0 } for await number in stream {     print(number, terminator: " ") } // Prints "3 4 5 6 7 8 9 10 " After the predicate returns false, the sequence never executes it again, and from then on the sequence passes through elements from its underlying sequence as-is.

## See Also

### Excluding Elements

- [dropFirst(_:)](swift/asyncsequence/dropfirst(_:).md)
- [AsyncDropFirstSequence](swift/asyncdropfirstsequence.md)
- [AsyncDropWhileSequence](swift/asyncdropwhilesequence.md)
- [drop(while:)](swift/asyncsequence/drop(while:)-67kgo.md)
- [AsyncThrowingDropWhileSequence](swift/asyncthrowingdropwhilesequence.md)
- [filter(_:)](swift/asyncsequence/filter(_:)-435af.md)
- [AsyncFilterSequence](swift/asyncfiltersequence.md)
- [filter(_:)](swift/asyncsequence/filter(_:)-2cc0l.md)
- [AsyncThrowingFilterSequence](swift/asyncthrowingfiltersequence.md)