# extracting(_:) Constructs a new span over the items within the supplied range of indices within this span. ``` mutating func extracting(_ bounds: Range.Index>) -> MutableSpan ``` ## Parameters `bounds` A valid range of indices. Every index in this range must be within the bounds of this `MutableSpan`. ## Return Value A `MutableSpan` over the items within `bounds`. ## Discussion The returned span represents a mutation of this span. The returned span’s first item is always at offset 0; unlike buffer slices, extracted spans do not share their indices with the span from which they are extracted. > Complexity: O(1) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)