Iterate all inner NSDictionary items and change them?

Question

In my particular case I have NSDictionary object which can contain NSString objects as keys and NSString and NSDictionary objects as values. The inner dictionaries can also contain NSDictionary objects.

What if I need to iterate all the inner NSString objects and append a letter to them? Note: I need to change both values and keys

Answer 1

In Swift:

func adjustNextLayer(inDictionary dictionary: inout [String:Any], for key: String) {
    if let newString = myDictionary[key] as? String {
        myDictionary[key] = "\(newString) insert some text to append here"
    } else {
        If let newDictionary = myDictionary[key] as? [String: Any] {
            newDictionary.keys.foreach { key in
                adjustNextLayer(inDictionary: newDictionary, for: key}
                myDictionary[key] = newDictionary
            }
        }
    }
}

let myDictionary = ["a":1, "b":2]
let keys = myDictionary.keys
keys.foreach { key in
    adjustNextLayer(inDictionary: myDictionary, for: key)
}

Remember that you can place functions inside of functions in swift. This would all be in one function of its own.

Of course, you could also use flatMap, but that goes at most two layers deep.

As for changing keys, why not set the previous key to nil and then make a new entry in the dictionary?