How to check if an object is dictionary or not in swift 3?

Question

Tried the 'is' keyword.

// Initialize the dictionary

let dict = ["name":"John", "surname":"Doe"]

// Check if 'dict' is a Dictionary

if dict is Dictionary {
    print("Yes, it's a Dictionary")
}

This will give an error saying "'is' is always true". I just want to check if an object is a dictionary. It can be with any key any value pairs.

The key is hashable and it is not accepting the Any keyword.

Answer 1

If you want to check if an arbitrary object is a dictionary first of all you have to make the object unspecified:

let dict : Any = ["name":"John", "surname":"Doe"]

Now you can check if the object is a dictionary

if dict is Dictionary<AnyHashable,Any> {
    print("Yes, it's a Dictionary")
}

But this way is theoretical and only for learning purposes. Basically it's pretty silly to cast up a distinct to an unspecified type.

Answer 2

If you just want to check if your object is Dictionary you can just do this:

if let dictionary = yourObject as? Dictionary{

    print("It is a Dictionary")

}