NestedKey - ness

gistfile1.txt

import UIKit

extension DictionaryLiteralConvertible where Key == String {
    
    func nestedKey(key:String) -> AnyObject?{
    
        let keys = key.componentsSeparatedByString(".")
        
        let target:AnyObject? = self as? AnyObject
        
        return keys.reduce(target) {x, y in
            
            if x == nil { return x }
            
            guard let curDict = x as? [String : AnyObject] else{
                return nil
            }
            
            guard let next = curDict[y] else{
                return nil
            }
            
            return next
        }
    }
}

let string = "a.b.c.d"

let dict = [ "a":["b":["c":["d":"Data"]]]]

let res = dict.nestedKey(string)

print(res)
//Optional(Data)