Instance Subscriptswift 6.0.1Swift
subscript(_:)
Accesses the Unicode scalar value at the given position.
subscript(position: String.UnicodeScalarView.Index) -> Unicode.Scalar { get } Parameters
- position
A valid index of the character view.
positionmust be less than the view’s end index.
The following example searches a string’s Unicode scalars view for a capital letter and then prints the character and Unicode scalar value at the found index:
let greeting = "Hello, friend!"
if let i = greeting.unicodeScalars.firstIndex(where: { "A"..."Z" ~= $0 }) {
print("First capital letter: \(greeting.unicodeScalars[i])")
print("Unicode scalar value: \(greeting.unicodeScalars[i].value)")
}
// Prints "First capital letter: H"
// Prints "Unicode scalar value: 72"Other members in extension
Types
Typealiases
Type members
init() Creates an empty view instance.
Instance members
var customMirror: MirrorReturns a mirror that reflects the Unicode scalars view of a string.
var debugDescription: Stringvar description: Stringvar endIndex: String.UnicodeScalarView.IndexThe “past the end” position—that is, the position one greater than the last valid subscript argument.
var startIndex: String.UnicodeScalarView.IndexThe position of the first Unicode scalar value if the string is nonempty.
subscript(Range<String.UnicodeScalarView.Index>) -> String.UnicodeScalarView.SubSequence func append(Unicode.Scalar) Appends the given Unicode scalar to the view.
func append<S>(contentsOf: S) Appends the Unicode scalar values in the given sequence to the view.
func distance(from: String.UnicodeScalarView.Index, to: String.UnicodeScalarView.Index) -> Int func index(String.UnicodeScalarView.Index, offsetBy: Int) -> String.UnicodeScalarView.Index func index(String.UnicodeScalarView.Index, offsetBy: Int, limitedBy: String.UnicodeScalarView.Index) -> String.UnicodeScalarView.Index? func index(after: String.UnicodeScalarView.Index) -> String.UnicodeScalarView.Index Returns the next consecutive location after
i.func index(before: String.UnicodeScalarView.Index) -> String.UnicodeScalarView.Index Returns the previous consecutive location before
i.func makeIterator() -> String.UnicodeScalarView.Iterator func replaceSubrange<C>(Range<String.UnicodeScalarView.Index>, with: C) Replaces the elements within the specified bounds with the given Unicode scalar values.
func reserveCapacity(Int) Reserves enough space in the view’s underlying storage to store the specified number of ASCII characters.