CamelCase - CamelCased and llamaCase - llamaCased extensions to String in Swift 3.0

llamaCamelCased.swift

import UIKit
// Swift 3.0

// Helper
public extension Character {
    public var stringValue: String { return String(self) }
}

extension String {
    // MARK: - CamelCase
    // Ironically, function call must be in llamaCase
    func camelCase() -> String {
        return self.components(separatedBy: CharacterSet.alphanumerics.inverted)
            .filter { !$0.isEmpty }
            .map { $0.capitalized }
            .joined()
    }
    
    mutating func camelCased() {
        self = self.camelCase()
    }
    
    // MARK: - LlamaCase
    func llamaCase() -> String {
        var result = self.camelCase()
        if let firstLetter = result.characters.popFirst()?.stringValue {
            result = firstLetter.lowercased() + result
        }
        return result
    }
    
    mutating func llamaCased() {
        self = self.llamaCase()
    }
}    

Swift apparently dropped the popFirst for strings, so llamaCase no longer works directly. I got it to work as follows:

func llamaCase() -> String {
	var result = self.camelCase()
	if result != "" {
		let firstLetter = result.removeFirst().stringValue
		result = firstLetter.lowercased() + result
	}
	return result
}