# RangeReplaceableCollection Implementations ## Topics ### Operators [`static func + (Other, Self) -> Self`](/documentation/Swift/Substring/+(_:_:)-6h592) Creates a new collection by concatenating the elements of a sequence and a collection. [`static func + (Self, Other) -> Self`](/documentation/Swift/Substring/+(_:_:)-9fm63) Creates a new collection by concatenating the elements of two collections. [`static func + (Self, Other) -> Self`](/documentation/Swift/Substring/+(_:_:)-n335) Creates a new collection by concatenating the elements of a collection and a sequence. [`static func += (inout Self, Other)`](/documentation/Swift/Substring/+=(_:_:)) Appends the elements of a sequence to a range-replaceable collection. ### Initializers [`init(S)`](/documentation/Swift/Substring/init(_:)-1ip9z) Creates a new instance of a collection containing the elements of a sequence. [`init(S)`](/documentation/Swift/Substring/init(_:)-6lxbv) Creates a new instance of a collection containing the elements of a sequence. [`init(repeating: Self.Element, count: Int)`](/documentation/Swift/Substring/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/append(_:)) Adds an element to the end of the collection. [`func append(contentsOf: S)`](/documentation/Swift/Substring/append(contentsOf:)) Adds the elements of a sequence or collection to the end of this collection. [`func append(contentsOf: S)`](/documentation/Swift/Substring/append(contentsOf:)-9folw) Adds the elements of a sequence or collection to the end of this collection. [`func applying(CollectionDifference) -> Self?`](/documentation/Swift/Substring/applying(_:)) Applies the given difference to this collection. [`func filter((Self.Element) throws(E) -> Bool) throws(E) -> Self`](/documentation/Swift/Substring/filter(_:)-66nvb) 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/insert(_:at:)) Inserts a new element into the collection at the specified position. [`func insert(contentsOf: C, at: Self.Index)`](/documentation/Swift/Substring/insert(contentsOf:at:)) Inserts the elements of a sequence into the collection at the specified position. [`func popLast() -> Self.Element?`](/documentation/Swift/Substring/popLast()-70a2x) Removes and returns the last element of the collection. [`func popLast() -> Self.Element?`](/documentation/Swift/Substring/popLast()-nrp9) Removes and returns the last element of the collection. [`func remove(at: Self.Index) -> Self.Element`](/documentation/Swift/Substring/remove(at:)) Removes and returns the element at the specified position. [`func removeAll(keepingCapacity: Bool)`](/documentation/Swift/Substring/removeAll(keepingCapacity:)) Removes all elements from the collection. [`func removeAll(where: (Self.Element) throws -> Bool) rethrows`](/documentation/Swift/Substring/removeAll(where:)) Removes all the elements that satisfy the given predicate. [`func removeFirst() -> Self.Element`](/documentation/Swift/Substring/removeFirst()-2cpd8) Removes and returns the first element of the collection. [`func removeFirst() -> Self.Element`](/documentation/Swift/Substring/removeFirst()-39om1) Removes and returns the first element of the collection. [`func removeFirst(Int)`](/documentation/Swift/Substring/removeFirst(_:)-43evo) Removes the specified number of elements from the beginning of the collection. [`func removeFirst(Int)`](/documentation/Swift/Substring/removeFirst(_:)-5s82s) Removes the specified number of elements from the beginning of the collection. [`func removeLast() -> Self.Element`](/documentation/Swift/Substring/removeLast()-4kq76) Removes and returns the last element of the collection. [`func removeLast() -> Self.Element`](/documentation/Swift/Substring/removeLast()-5b56p) Removes and returns the last element of the collection. [`func removeLast(Int)`](/documentation/Swift/Substring/removeLast(_:)-1xrzw) Removes the specified number of elements from the end of the collection. [`func removeLast(Int)`](/documentation/Swift/Substring/removeLast(_:)-5ulmx) Removes the specified number of elements from the end of the collection. [`func removeSubrange(Range)`](/documentation/Swift/Substring/removeSubrange(_:)-8mayj) Removes the elements in the specified subrange from the collection. [`func removeSubrange(R)`](/documentation/Swift/Substring/removeSubrange(_:)-9twoc) Removes the elements in the specified subrange from the collection. [`func removeSubranges(RangeSet)`](/documentation/Swift/Substring/removeSubranges(_:)) Removes the elements at the given indices. [`func replaceSubrange(Range, with: C)`](/documentation/Swift/Substring/replaceSubrange(_:with:)-3hke2) Replaces the specified subrange of elements with the given collection. [`func replaceSubrange(Range, with: C)`](/documentation/Swift/Substring/replaceSubrange(_:with:)-5g58l) Replaces the specified subrange of elements with the given collection. [`func replaceSubrange(R, with: C)`](/documentation/Swift/Substring/replaceSubrange(_:with:)-7293b) Replaces the specified subrange of elements with the given collection. [`func reserveCapacity(Int)`](/documentation/Swift/Substring/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)