# RangeReplaceableCollection Implementations ## Topics ### Operators [`static func + (Other, Self) -> Self`](/documentation/Swift/Substring/UnicodeScalarView/+(_:_:)-1c1pd) Creates a new collection by concatenating the elements of a sequence and a collection. [`static func + (Self, Other) -> Self`](/documentation/Swift/Substring/UnicodeScalarView/+(_:_:)-1p67y) Creates a new collection by concatenating the elements of two collections. [`static func + (Self, Other) -> Self`](/documentation/Swift/Substring/UnicodeScalarView/+(_:_:)-9qjws) Creates a new collection by concatenating the elements of a collection and a sequence. [`static func += (inout Self, Other)`](/documentation/Swift/Substring/UnicodeScalarView/+=(_:_:)) Appends the elements of a sequence to a range-replaceable collection. ### Initializers [`init()`](/documentation/Swift/Substring/UnicodeScalarView/init()) Creates a new, empty collection. [`init(S)`](/documentation/Swift/Substring/UnicodeScalarView/init(_:)) Creates a new instance of a collection containing the elements of a sequence. [`init(repeating: Self.Element, count: Int)`](/documentation/Swift/Substring/UnicodeScalarView/init(repeating:count:)) Creates a new collection containing the specified number of a single, repeated value. ### Instance Methods [`func append(Self.Element)`](/documentation/Swift/Substring/UnicodeScalarView/append(_:)) Adds an element to the end of the collection. [`func append(contentsOf: S)`](/documentation/Swift/Substring/UnicodeScalarView/append(contentsOf:)) Adds the elements of a sequence or collection to the end of this collection. [`func applying(CollectionDifference) -> Self?`](/documentation/Swift/Substring/UnicodeScalarView/applying(_:)) Applies the given difference to this collection. [`func filter((Self.Element) throws(E) -> Bool) throws(E) -> Self`](/documentation/Swift/Substring/UnicodeScalarView/filter(_:)-6e5i2) Returns a new collection of the same type containing, in order, the elements of the original collection that satisfy the given predicate. [`func insert(Self.Element, at: Self.Index)`](/documentation/Swift/Substring/UnicodeScalarView/insert(_:at:)) Inserts a new element into the collection at the specified position. [`func insert(contentsOf: C, at: Self.Index)`](/documentation/Swift/Substring/UnicodeScalarView/insert(contentsOf:at:)) Inserts the elements of a sequence into the collection at the specified position. [`func popLast() -> Self.Element?`](/documentation/Swift/Substring/UnicodeScalarView/popLast()-46voy) Removes and returns the last element of the collection. [`func popLast() -> Self.Element?`](/documentation/Swift/Substring/UnicodeScalarView/popLast()-7zgh4) Removes and returns the last element of the collection. [`func remove(at: Self.Index) -> Self.Element`](/documentation/Swift/Substring/UnicodeScalarView/remove(at:)) Removes and returns the element at the specified position. [`func removeAll(keepingCapacity: Bool)`](/documentation/Swift/Substring/UnicodeScalarView/removeAll(keepingCapacity:)) Removes all elements from the collection. [`func removeAll(where: (Self.Element) throws -> Bool) rethrows`](/documentation/Swift/Substring/UnicodeScalarView/removeAll(where:)) Removes all the elements that satisfy the given predicate. [`func removeFirst() -> Self.Element`](/documentation/Swift/Substring/UnicodeScalarView/removeFirst()-2a3ja) Removes and returns the first element of the collection. [`func removeFirst() -> Self.Element`](/documentation/Swift/Substring/UnicodeScalarView/removeFirst()-5t2ib) Removes and returns the first element of the collection. [`func removeFirst(Int)`](/documentation/Swift/Substring/UnicodeScalarView/removeFirst(_:)-2lfkb) Removes the specified number of elements from the beginning of the collection. [`func removeFirst(Int)`](/documentation/Swift/Substring/UnicodeScalarView/removeFirst(_:)-5314w) Removes the specified number of elements from the beginning of the collection. [`func removeLast() -> Self.Element`](/documentation/Swift/Substring/UnicodeScalarView/removeLast()-3izvn) Removes and returns the last element of the collection. [`func removeLast() -> Self.Element`](/documentation/Swift/Substring/UnicodeScalarView/removeLast()-75qy7) Removes and returns the last element of the collection. [`func removeLast(Int)`](/documentation/Swift/Substring/UnicodeScalarView/removeLast(_:)-30fw5) Removes the specified number of elements from the end of the collection. [`func removeLast(Int)`](/documentation/Swift/Substring/UnicodeScalarView/removeLast(_:)-74qgu) Removes the specified number of elements from the end of the collection. [`func removeSubrange(R)`](/documentation/Swift/Substring/UnicodeScalarView/removeSubrange(_:)-2qm37) Removes the elements in the specified subrange from the collection. [`func removeSubrange(Range)`](/documentation/Swift/Substring/UnicodeScalarView/removeSubrange(_:)-5c1al) Removes the elements in the specified subrange from the collection. [`func removeSubranges(RangeSet)`](/documentation/Swift/Substring/UnicodeScalarView/removeSubranges(_:)) Removes the elements at the given indices. [`func replaceSubrange(Range, with: C)`](/documentation/Swift/Substring/UnicodeScalarView/replaceSubrange(_:with:)) Replaces the specified subrange of elements with the given collection. [`func replaceSubrange(Range, with: C)`](/documentation/Swift/Substring/UnicodeScalarView/replaceSubrange(_:with:)-4kmx6) Replaces the specified subrange of elements with the given collection. [`func replaceSubrange(R, with: C)`](/documentation/Swift/Substring/UnicodeScalarView/replaceSubrange(_:with:)-7xjpm) Replaces the specified subrange of elements with the given collection. [`func reserveCapacity(Int)`](/documentation/Swift/Substring/UnicodeScalarView/reserveCapacity(_:)) Prepares the collection to store the specified number of elements, when doing so is appropriate for the underlying type. --- 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)