Swift 3/4 dash to camel case (Snake to camelCase)

extension String {
    func dashToCamelCase() -> String {
        var result = ""
        let components = self.components(separatedBy: "-")
        for (index, component) in components.enumerated() {
            if index == 0 {
                result += component
            } else {
                result += component.capitalized
            }
        }
        return result
    }
}

let snakeCaseString = "swift-3-4-dash-to-camel-case"
let camelCaseString = snakeCaseString.dashToCamelCase()
print(camelCaseString)  // 输出 "swift34DashToCamelCase"