MIT App Inventor 2: Dictionaries and JSON

The use and importance of Dictionaries for data structuring is explained, including the examples. Emphasis is placed on the connection to JavaScript Object Notation (JSON). 00:01 What are the Dictionaries 00:33 How to build simple example pairs (played at 3x speed) 01:30 Explanation of the simple pair-entries 01:53 Display a Dictionary in a ListView 02:22 Connection to JSON 02:44 Showcase more complex Data Objects 05:28 How to retrieve a Value/List from nested Dictionaries [Walking Key Path]