Get nth character of a string in Swift programming language

Question

How can I get the nth character of a string? I tried bracket([]) accessor with no luck.

var string = \"Hello, world!\"

var firstChar = string[         


        

Answer 1

Swift 3

extension String {

    public func charAt(_ i: Int) -> Character {
        return self[self.characters.index(self.startIndex, offsetBy: i)]
    }

    public subscript (i: Int) -> String {
        return String(self.charAt(i) as Character)
    }

    public subscript (r: Range) -> String {
        return substring(with: self.characters.index(self.startIndex, offsetBy: r.lowerBound)..) -> String {
        return substring(with: self.characters.index(self.startIndex, offsetBy: r.lowerBound)..

Usage

let str = "Hello World"
let sub = str[0...4]

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