# MutableCollection Implementations ## Topics ### Instance Methods [`func moveSubranges(RangeSet, to: Self.Index) -> Range`](/documentation/Swift/Dictionary/Values-swift.struct/moveSubranges(_:to:)) Moves the elements in the given subranges to just before the element at the specified index. [`func partition(by: (Self.Element) throws -> Bool) rethrows -> Self.Index`](/documentation/Swift/Dictionary/Values-swift.struct/partition(by:)) Reorders the elements of the collection such that all the elements that match the given predicate are after all the elements that don’t match. [`func swapAt(Self.Index, Self.Index)`](/documentation/Swift/Dictionary/Values-swift.struct/swapAt(_:_:)-18i76) Exchanges the values at the specified indices of the collection. [`func withContiguousMutableStorageIfAvailable((inout UnsafeMutableBufferPointer) throws -> R) rethrows -> R?`](/documentation/Swift/Dictionary/Values-swift.struct/withContiguousMutableStorageIfAvailable(_:)) Executes a closure on the collection’s contiguous storage. --- 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)