A generic -objectForKey: (e.g. NSUserDefaults, NSCache)

gistfile1.txt

var dictionary = ["yolo": 9]

func objectForKey<T>(key: String) -> T? {
    let obj = dictionary[key]
    
    if let obj = obj as? T {
        return obj
    }
    
    return nil
}

let obj: String? = objectForKey("yolo")
println(obj)

let value: Int? = objectForKey("yolo")
println(value)