# RangeReplaceableCollection Implementations ## Topics ### Operators [`static func + (Other, Self) -> Self`](/documentation/Swift/String/+(_:_:)-6h59y) Creates a new collection by concatenating the elements of a sequence and a collection. [`static func + (Self, Other) -> Self`](/documentation/Swift/String/+(_:_:)-9fm57) Creates a new collection by concatenating the elements of two collections. [`static func + (Self, Other) -> Self`](/documentation/Swift/String/+(_:_:)-n329) Creates a new collection by concatenating the elements of a collection and a sequence. [`static func += (inout Self, Other)`](/documentation/Swift/String/+=(_:_:)-676gx) Appends the elements of a sequence to a range-replaceable collection. ### Initializers [`init(S)`](/documentation/Swift/String/init(_:)-1ip93) Creates a new instance of a collection containing the elements of a sequence. [`init(S)`](/documentation/Swift/String/init(_:)-8og6g) Creates a new string containing the characters in the given sequence. [`init(repeating: Character, count: Int)`](/documentation/Swift/String/init(repeating:count:)-11bpi) Creates a string representing the given character repeated the specified number of times. [`init(repeating: Self.Element, count: Int)`](/documentation/Swift/String/init(repeating:count:)-5y5em) Creates a new collection containing the specified number of a single, repeated value. ### Instance Methods [`func append(Self.Element)`](/documentation/Swift/String/append(_:)-1re5n) Adds an element to the end of the collection. [`func append(Character)`](/documentation/Swift/String/append(_:)-4xi3j) Appends the given character to the string. [`func append(contentsOf: S)`](/documentation/Swift/String/append(contentsOf:)-7est5) Appends the characters in the given sequence to the string. [`func append(contentsOf: S)`](/documentation/Swift/String/append(contentsOf:)-9foms) Adds the elements of a sequence or collection to the end of this collection. [`func applying(CollectionDifference) -> Self?`](/documentation/Swift/String/applying(_:)) Applies the given difference to this collection. [`func filter((Self.Element) throws(E) -> Bool) throws(E) -> Self`](/documentation/Swift/String/filter(_:)-66nw7) Returns a new collection of the same type containing, in order, the elements of the original collection that satisfy the given predicate. [`func insert(Character, at: String.Index)`](/documentation/Swift/String/insert(_:at:)) Inserts a new character at the specified position. [`func insert(Self.Element, at: Self.Index)`](/documentation/Swift/String/insert(_:at:)-88yqh) Inserts a new element into the collection at the specified position. [`func insert(contentsOf: S, at: String.Index)`](/documentation/Swift/String/insert(contentsOf:at:)) Inserts a collection of characters at the specified position. [`func insert(contentsOf: C, at: Self.Index)`](/documentation/Swift/String/insert(contentsOf:at:)-rdu9) Inserts the elements of a sequence into the collection at the specified position. [`func popLast() -> Self.Element?`](/documentation/Swift/String/popLast()) Removes and returns the last element of the collection. [`func remove(at: String.Index) -> Character`](/documentation/Swift/String/remove(at:)) Removes and returns the character at the specified position. [`func remove(at: Self.Index) -> Self.Element`](/documentation/Swift/String/remove(at:)-5g0wm) Removes and returns the element at the specified position. [`func removeAll(keepingCapacity: Bool)`](/documentation/Swift/String/removeAll(keepingCapacity:)) Replaces this string with the empty string. [`func removeAll(keepingCapacity: Bool)`](/documentation/Swift/String/removeAll(keepingCapacity:)-6xw7h) Removes all elements from the collection. [`func removeAll(where: (Self.Element) throws -> Bool) rethrows`](/documentation/Swift/String/removeAll(where:)) Removes all the elements that satisfy the given predicate. [`func removeFirst() -> Self.Element`](/documentation/Swift/String/removeFirst()) Removes and returns the first element of the collection. [`func removeFirst(Int)`](/documentation/Swift/String/removeFirst(_:)) Removes the specified number of elements from the beginning of the collection. [`func removeLast() -> Self.Element`](/documentation/Swift/String/removeLast()) Removes and returns the last element of the collection. [`func removeLast(Int)`](/documentation/Swift/String/removeLast(_:)) Removes the specified number of elements from the end of the collection. [`func removeSubrange(Range)`](/documentation/Swift/String/removeSubrange(_:)) Removes the characters in the given range. [`func removeSubrange(Range)`](/documentation/Swift/String/removeSubrange(_:)-8maxn) Removes the elements in the specified subrange from the collection. [`func removeSubrange(R)`](/documentation/Swift/String/removeSubrange(_:)-9twng) Removes the elements in the specified subrange from the collection. [`func removeSubranges(RangeSet)`](/documentation/Swift/String/removeSubranges(_:)) Removes the elements at the given indices. [`func replaceSubrange(Range, with: C)`](/documentation/Swift/String/replaceSubrange(_:with:)) Replaces the text within the specified bounds with the given characters. [`func replaceSubrange(Range, with: C)`](/documentation/Swift/String/replaceSubrange(_:with:)-3hkd6) Replaces the specified subrange of elements with the given collection. [`func replaceSubrange(R, with: C)`](/documentation/Swift/String/replaceSubrange(_:with:)-72947) Replaces the specified subrange of elements with the given collection. [`func reserveCapacity(Int)`](/documentation/Swift/String/reserveCapacity(_:)) Reserves enough space in the string’s underlying storage to store the specified number of ASCII characters. [`func reserveCapacity(Int)`](/documentation/Swift/String/reserveCapacity(_:)-8lw57) 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)