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swift-mirror/stdlib/stdlib.docc/String.md
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Graham Lee 9ead8781d4 Add .docc catalog to publish stdlib docs on swift.org 
Co-authored-by: Alex Martini <amartini@apple.com>
Co-authored-by: Graham Lee <glee23@apple.com>
Co-authored-by: Chris Adamson <cadamson@apple.com>
Co-authored-by: Kirby Turner <kirby_turner@apple.com>
Co-authored-by: Paris Pinkney <ppinkney@apple.com>
Co-authored-by: Dave Spector <dspector@apple.com>
Co-authored-by: Sofia Rodriguez Morales <sofia_rodriguez@apple.com>
Co-authored-by: Ethan Kusters <ekusters@apple.com>
Co-authored-by: Goli Mohammadi <g_mohammadi@apple.com>
Co-authored-by: Adora Vaz <a_vaz@apple.com>
Co-authored-by: David Rönnqvist <ronnqvist@apple.com>
Co-authored-by: Nate Merseth Cook <natecook@apple.com>
Co-authored-by: Susan Conant <susan_c@apple.com>
2026-04-10 10:04:56 -04:00

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Swift/String

Topics

Creating a String

In addition to creating a string from a single string literal, you can also create an empty string, a string containing an existing group of characters, or a string repeating the contents of another string.

  • Swift/String/init()
  • Swift/String/init(_:)-8v3fo
  • Swift/String/init(_:)-8og6g
  • Swift/String/init(_:)-1ip93
  • Swift/String/init(_:)-50pwi
  • Swift/String/init(_:)-14lv5
  • Swift/String/init(repeating:count:)-23xjt
  • Swift/String/init(repeating:count:)-11bpi
  • Swift/String/init(unsafeUninitializedCapacity:initializingUTF8With:)

Inspecting a String

  • Swift/String/isEmpty-vc7l
  • Swift/String/count-7qyfb

Creating a String from Unicode Data

  • Swift/String/init(_:)-8ay23
  • Swift/String/init(validatingUTF8:)-208fn
  • Swift/String/init(validating:as:)-(Sequence<Encoding.CodeUnit>,_)
  • Swift/String/init(validating:as:)-(Sequence<Int8>,_)
  • Swift/String/init(decoding:as:)
  • Swift/String/init(_:)-3rgu
  • Swift/String/init(copying:)

Converting Numeric Values

  • Swift/String/init(_:radix:uppercase:)

Converting a C String

  • Swift/String/init(validatingCString:)-992vo
  • Swift/String/init(validatingCString:)-98wra
  • Swift/String/init(cString:)-2p84k
  • Swift/String/init(cString:)-6kr8s
  • Swift/String/init(decodingCString:as:)-8way7
  • Swift/String/decodeCString(_:as:repairingInvalidCodeUnits:)-46n2p
  • Swift/String/init(cString:)-472zs
  • Swift/String/init(cString:)-54awj

Converting a C++ String

  • Swift/String/init(_:)-4bhtc
  • Swift/String/init(_:)-753pq
  • Swift/String/init(_:)-779lt
  • Swift/String/init(_:)-7i93e
  • Swift/String/init(_:)-871md
  • Swift/String/init(_:)-8h97e
  • Swift/String/init(_:)-lk68
  • Swift/String/init(_:)-p219

Converting Other Types to Strings

  • Swift/String/init(_:)-1ywfq
  • Swift/String/init(describing:)-588wb
  • Swift/String/init(describing:)-hsqw
  • Swift/String/init(describing:)-6ttci
  • Swift/String/init(describing:)-67ncf
  • Swift/String/init(reflecting:)

Writing to a File or URL

  • Swift/String/write(_:)
  • Swift/String/write(to:)

Appending Strings and Characters

  • Swift/String/append(_:)-4xa8f
  • Swift/String/append(_:)-4xi3j
  • Swift/String/append(contentsOf:)-oxek
  • Swift/String/append(contentsOf:)-9vb4t
  • Swift/String/append(contentsOf:)-7est5
  • Swift/String/append(contentsOf:)-9foms
  • Swift/String/reserveCapacity(_:)-1ozk3
  • Swift/String/+(_:_:)-655mi
  • Swift/String/+=(_:_:)-4pvxa
  • Swift/String/+(_:_:)-6h59y
  • Swift/String/+(_:_:)-n329
  • Swift/String/+(_:_:)-9fm57
  • Swift/String/+=(_:_:)-676gx

Inserting Characters

  • Swift/String/insert(_:at:)-1uqvy
  • Swift/String/insert(_:at:)-88yqh
  • Swift/String/insert(contentsOf:at:)-rdu9
  • Swift/String/insert(contentsOf:at:)-4may

Replacing Substrings

  • Swift/String/replaceSubrange(_:with:)-1wyxa
  • Swift/String/replaceSubrange(_:with:)-72947

Removing Substrings

  • Swift/String/remove(at:)-4n29z
  • Swift/String/remove(at:)-5g0wm
  • Swift/String/removeAll(keepingCapacity:)-b1dr
  • Swift/String/removeAll(where:)
  • Swift/String/removeFirst()
  • Swift/String/removeFirst(_:)
  • Swift/String/removeLast()
  • Swift/String/removeLast(_:)
  • Swift/String/removeSubrange(_:)-8y51u
  • Swift/String/removeSubrange(_:)-8maxn
  • Swift/String/removeSubrange(_:)-9twng
  • Swift/String/filter(_:)
  • Swift/String/drop(while:)
  • Swift/String/dropFirst(_:)
  • Swift/String/dropLast(_:)
  • Swift/String/popLast()

Changing Case

  • Swift/String/lowercased()
  • Swift/String/uppercased()

Comparing Strings Using Operators

Comparing strings using the equal-to operator (==) or a relational operator (like < and >=) is always performed using the Unicode canonical representation, so that different representations of a string compare as being equal.

  • Swift/String/==(_:_:)-9812z
  • Swift/String/==(_:_:)-8kzxf
  • Swift/String/!=(_:_:)-1bb05
  • Swift/String/!=(_:_:)-frzf
  • Swift/String/<(_:_:)-1incq
  • Swift/String/<(_:_:)-8d1wy
  • Swift/String/<=(_:_:)-1ih6
  • Swift/String/<=(_:_:)-5y22v
  • Swift/String/>(_:_:)-24u5x
  • Swift/String/>(_:_:)-6o7qv
  • Swift/String/>=(_:_:)-8lyim
  • Swift/String/>=(_:_:)-nd86
  • Swift/String/~=(_:_:)

Comparing Characters

  • Swift/String/elementsEqual(_:)
  • Swift/String/elementsEqual(_:by:)
  • Swift/String/starts(with:)
  • Swift/String/starts(with:by:)
  • Swift/String/lexicographicallyPrecedes(_:)
  • Swift/String/lexicographicallyPrecedes(_:by:)

Creating and Applying Differences

  • Swift/String/applying(_:)
  • Swift/String/difference(from:)
  • Swift/String/difference(from:by:)

Finding Substrings

  • Swift/String/hasPrefix(_:)
  • Swift/String/hasSuffix(_:)

Finding Characters

  • Swift/String/characters
  • Swift/String/utf8Span
  • Swift/String/contains(_:)
  • Swift/String/allSatisfy(_:)
  • Swift/String/contains(where:)
  • Swift/String/first(where:)
  • Swift/String/firstIndex(of:)
  • Swift/String/firstIndex(where:)
  • Swift/String/last(where:)
  • Swift/String/lastIndex(of:)
  • Swift/String/lastIndex(where:)
  • Swift/String/max()
  • Swift/String/max(_:_:)
  • Swift/String/max(by:)
  • Swift/String/min()
  • Swift/String/min(_:_:)
  • Swift/String/min(by:)
  • Swift/String/characterMap()
  • Swift/String/scalarMap()

Getting Substrings

  • Swift/String/subscript(_:)-2so14
  • Swift/String/subscript(_:)-4h7s3
  • Swift/String/subscript(_:)-4al9c
  • Swift/String/prefix(_:)
  • Swift/String/prefix(through:)
  • Swift/String/prefix(upTo:)
  • Swift/String/prefix(while:)
  • Swift/String/suffix(_:)
  • Swift/String/suffix(from:)

Splitting a String

  • Swift/String/split(separator:maxSplits:omittingEmptySubsequences:)
  • Swift/String/split(maxSplits:omittingEmptySubsequences:whereSeparator:)

Getting Characters and Bytes

  • Swift/String/subscript(_:)-lc0v
  • Swift/String/first
  • Swift/String/last
  • Swift/String/randomElement()
  • Swift/String/randomElement(using:)

Working with Encodings

  • Swift/String/isContiguousUTF8
  • Swift/String/makeContiguousUTF8()
  • Swift/String/withUTF8(_:)

Working with String Views

  • Swift/String/unicodeScalars
  • Swift/String/UnicodeScalarIndex
  • Swift/String/init(_:)-2t931
  • Swift/String/init(_:)-11jx3
  • Swift/String/utf16
  • Swift/String/init(_:)-wbcx
  • Swift/String/init(_:)-expd
  • Swift/String/utf8
  • Swift/String/init(_:)-6sprj
  • Swift/String/init(_:)-83bub

Transforming a String's Characters

  • Swift/String/compactMap(_:)
  • Swift/String/flatMap(_:)-i3m9
  • Swift/String/flatMap(_:)-6chuq
  • Swift/String/reduce(_:_:)
  • Swift/String/reduce(into:_:)
  • Swift/String/lazy
  • Swift/String/withMutableCharacters(_:)

Iterating over a String's Characters

  • Swift/String/forEach(_:)
  • Swift/String/enumerated()
  • Swift/String/makeIterator()
  • Swift/String/underestimatedCount-4ggs3

Reordering a String's Characters

  • Swift/String/sorted()
  • Swift/String/sorted(by:)
  • Swift/String/reversed()
  • Swift/String/shuffled()
  • Swift/String/shuffled(using:)

Getting C Strings

  • Swift/String/utf8CString
  • Swift/String/withCString(_:)
  • Swift/String/withCString(encodedAs:_:)

Working with Paths

  • Swift/String/init(validatingUTF8:)-(String)
  • Swift/String/init(validatingUTF8:)-(UnsafePointer<CChar>)
  • Swift/String/init(validatingUTF8:)-([CChar])
  • Swift/String/init(validatingUTF8:)-(CChar)

Manipulating Indices

  • Swift/String/startIndex
  • Swift/String/endIndex
  • Swift/String/allIndices(includingEnd:)
  • Swift/String/dumpIndices()
  • Swift/String/index(after:)
  • Swift/String/formIndex(after:)
  • Swift/String/index(before:)
  • Swift/String/formIndex(before:)
  • Swift/String/index(_:offsetBy:)
  • Swift/String/index(_:offsetBy:limitedBy:)
  • Swift/String/formIndex(_:offsetBy:)
  • Swift/String/formIndex(_:offsetBy:limitedBy:)
  • Swift/String/distance(from:to:)
  • Swift/String/isOnGraphemeClusterBoundary(_:)
  • Swift/String/indices-swift.property

Creating a Range Expression

  • Swift/String/..<(_:_:)
  • Swift/String/...(_:_:)
  • Swift/String/..<(_:)
  • Swift/String/...(_:)-4mm4o
  • Swift/String/...(_:)-6ct5g

Encoding and Decoding

  • Swift/String/encode(to:)
  • Swift/String/init(from:)-qki5

Describing a String

  • Swift/String/description
  • Swift/String/debugDescription
  • Swift/String/customMirror
  • Swift/String/hash(into:)

Infrequently Used Functionality

  • Swift/String/index(of:)
  • Swift/String/init(stringInterpolation:)-1jjv
  • Swift/String/init(stringLiteral:)
  • Swift/String/init(unicodeScalarLiteral:)
  • Swift/String/init(extendedGraphemeClusterLiteral:)
  • Swift/String/customPlaygroundQuickLook
  • Swift/String/withContiguousStorageIfAvailable(_:)
  • Swift/String/init(cString:)-1gatt
  • Swift/String/init(cString:)-295hy
  • Swift/String/init(cString:)-cgw2
  • Swift/String/init(decodingCString:as:)-2zmjc
  • Swift/String/init(decodingCString:as:)-534rp
  • Swift/String/init(validatingCString:)-1x5p0
  • Swift/String/init(validatingCString:)-7gjlg
  • Swift/String/IndexDistance
  • Swift/String/decodeCString(_:as:repairingInvalidCodeUnits:)-2l7u6
  • Swift/String/decodeCString(_:as:repairingInvalidCodeUnits:)-9pdmv
  • Swift/String/decodeCString(_:as:repairingInvalidCodeUnits:)-3mvvy

Related String Types

  • Swift/Substring
  • Swift/StringProtocol
  • Swift/String/Index
  • Swift/String/CharacterView
  • Swift/String/UnicodeScalarView
  • Swift/String/UTF16View
  • Swift/String/UTF8View
  • Swift/String/Iterator
  • Swift/String/Output
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