Create Workout covering accessing nested data structures in JavaScript

[lizTheDeveloper]

We don't have any content that addresses deeply nested data structures, such as arrays in arrays, or objects that contain arrays of objects that contain arrays. This should take up an entire workout.

Show how to "build" to an expression that accesses a deeply nested structure, also find an exercise where they'll have to practice this.
Another useful insight in this would be one where you show how to break down a complex expression down into simpler, easier to read operations, which is useful for debugging or creating clearer code.

Objectives to cover:
js.evaluate-expressions.7: Accurately predict the result of complex JavaScript expressions operating on a data structure
js.evaluate-expressions.8: Accurately predict the result of complex data structure access operations
js.write-expressions.2: Decompose complex expressions into simple expressions