NativeScript for Mobile App Development State Management and Application Architecture 3

Question 1

When implementing Redux with NativeScript, what is the role of a 'reducer' function?

Accepted Answer

It takes the current state and an action and returns a new state

Answer

It renders UI components based on state

Answer

It dispatches actions to the store

Answer

It subscribes components to store changes

Question 2

In NativeScript, what is the primary advantage of using ObservableArray over a regular JavaScript array for list data?

Accepted Answer

ObservableArray automatically notifies ListView of item additions, removals, and changes

Answer

ObservableArray uses less memory

Answer

ObservableArray supports async iteration natively

Answer

ObservableArray encrypts its contents automatically

Question 3

What is 'property change batching' in the context of NativeScript Observable state updates?

Accepted Answer

Grouping multiple property changes to minimize UI re-renders

Answer

Saving multiple properties to disk simultaneously

Answer

Fetching several API properties in one network call

Answer

Encrypting multiple property values together

Question 4

Which NativeScript feature enables two different pages/modules to communicate state changes without a direct reference to each other?

Accepted Answer

The global application event bus using Application.on()/off()

Answer

Direct function calls between page code-behind files

Answer

SharedArrayBuffer between threads

Answer

URL query parameter passing only

Question 5

In a NativeScript app, what problem does the 'single source of truth' principle solve?

Accepted Answer

It prevents multiple conflicting copies of the same state across the app

Answer

It ensures only one file contains CSS styles

Answer

It forces all navigation to go through one route

Answer

It restricts database writes to a single table

Question 6

When should you prefer using NativeScript's ApplicationSettings over an in-memory Observable for storing user preferences?

Accepted Answer

When preferences must survive app restarts and device reboots

Answer

When the data changes very frequently per second

Answer

When performance is the only concern

Answer

When preferences are only needed during one screen session

Question 7

In NativeScript with Angular, what is the purpose of the async pipe when displaying observable state in templates?

Accepted Answer

It automatically subscribes to an Observable/Promise and unwraps the latest value in the template

Answer

It formats numbers asynchronously

Answer

It delays template rendering by a configurable timeout

Answer

It pipes data through a backend API before display