# MutableCollection Implementations ## Topics ### Instance Methods [`func moveSubranges(RangeSet, to: Self.Index) -> Range`](/documentation/Swift/Slice/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/Slice/partition(by:)-7efo8) 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 partition(by: (Self.Element) throws -> Bool) rethrows -> Self.Index`](/documentation/Swift/Slice/partition(by:)-7n9yj) 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 removeSubranges(RangeSet)`](/documentation/Swift/Slice/removeSubranges(_:)-20t3r) Removes the elements at the given indices. [`func reverse()`](/documentation/Swift/Slice/reverse()) Reverses the elements of the collection in place. [`func shuffle()`](/documentation/Swift/Slice/shuffle()) Shuffles the collection in place. [`func shuffle(using: inout T)`](/documentation/Swift/Slice/shuffle(using:)) Shuffles the collection in place, using the given generator as a source for randomness. [`func sort()`](/documentation/Swift/Slice/sort()) Sorts the collection in place. [`func sort(by: (Self.Element, Self.Element) throws -> Bool) rethrows`](/documentation/Swift/Slice/sort(by:)) Sorts the collection in place, using the given predicate as the comparison between elements. [`func swapAt(Self.Index, Self.Index)`](/documentation/Swift/Slice/swapAt(_:_:)) Exchanges the values at the specified indices of the collection. [`func withContiguousMutableStorageIfAvailable((inout UnsafeMutableBufferPointer.Element>) throws -> R) rethrows -> R?`](/documentation/Swift/Slice/withContiguousMutableStorageIfAvailable(_:)-2ual) Executes a closure on the collection’s contiguous storage. ### Subscripts [`subscript(Range) -> Self.SubSequence`](/documentation/Swift/Slice/subscript(_:)-2elba) [`subscript(UnboundedRange) -> Self.SubSequence`](/documentation/Swift/Slice/subscript(_:)-3p9dc) [`subscript(R) -> Self.SubSequence`](/documentation/Swift/Slice/subscript(_:)-4f8ky) [`subscript(Range.Index>) -> Slice`](/documentation/Swift/Slice/subscript(_:)-87kqd) Accesses a contiguous subrange of the collection’s elements. [`subscript(Range) -> Slice`](/documentation/Swift/Slice/subscript(_:)-8pq5s) Accesses a contiguous subrange of the collection’s elements. [`subscript(Range) -> Slice`](/documentation/Swift/Slice/subscript(_:)-uq47) Accesses a contiguous subrange of the collection’s elements. [`subscript(Slice.Index) -> Base.Element`](/documentation/Swift/Slice/subscript(_:)-z7ny) Accesses the element at the specified position. --- 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)