Dictionary without initialization? (in text adventure tut)

I am following Creating a Text Based Adventure Part 2 - Taking Items [5/10]

A dictionary is used (in 6:15 min) without initializing first like this:

Dictionary<string, string> takeDictionary = controller.interactableItems.Take(separatedInputWords);

Shouldn't you first initialize it? Or use like this:

Code (csharp):

1. Dictionary<string, string> myDict = new Dictionary<string, string>
2.         {
3.             { "key1", "value1" },
4.             { "key2", "value2" }
5.         };