---
title: "removeAll(keepingCapacity:)"
framework: swift
role: symbol
role_heading: Instance Method
path: "swift/string/unicodescalarview/removeall(keepingcapacity:)"
---

# removeAll(keepingCapacity:)

Removes all elements from the collection.

## Declaration

```swift
mutating func removeAll(keepingCapacity keepCapacity: Bool = false)
```

## Parameters

- `keepCapacity`: Pass true to request that the collection avoid releasing its storage. Retaining the collection’s storage can be a useful optimization when you’re planning to grow the collection again. The default value is false.

## Discussion

Discussion Calling this method may invalidate any existing indices for use with this collection. note: O(n), where n is the length of the collection.