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 2.2 Solution:

The following extension works in Xcode 7, this is a combination of this solution and Swift 2.0 syntax conversion.

extension String {
    subscript(integerIndex: Int) -> Character {
        let index = startIndex.advancedBy(integerIndex)
        return self[index]
    }

    subscript(integerRange: Range) -> String {
        let start = startIndex.advancedBy(integerRange.startIndex)
        let end = startIndex.advancedBy(integerRange.endIndex)
        let range = start..