AngularJS lesson 4 - linking inputboxes and dropdowns to multidimensional JSON array

- You will learn how to construct a JSON variable containing multiple arrays, and how to output a specific array element to the page.
- You will learn to use the ng-model directive to link an inputbox value to a JSON array index, so changing the value in the input box will output a specific element in the JSON array.
- You will learn to use dropdown menus to select elements from the JSON array.
- You will learn how to remove the empty cell at the top of the dropdown menu.