NativeScript for Mobile App Development Performance and Debugging

Question 1

Which NativeScript CLI flag enables verbose logging for build diagnostics?

Accepted Answer

--log verbose

Answer

The `--log verbose` flag on ns commands prints detailed build and runtime log output for diagnosing build failures.

Question 2

Which tool allows Chrome DevTools to debug a NativeScript application?

Accepted Answer

ns debug android (or ios) opens Chrome DevTools inspector

Answer

`ns debug android` starts the app in debug mode and opens a Chrome DevTools session for JavaScript debugging, breakpoints, and profiling.

Question 3

What is the main performance advantage of NativeScript over hybrid frameworks like Cordova?

Accepted Answer

Direct native API calls without a JavaScript-to-native bridge overhead

Answer

NativeScript calls native APIs directly through its runtime without a bridge, eliminating the serialization/deserialization overhead present in bridge-based frameworks.

Question 4

Which technique reduces NativeScript app startup time by pre-initializing the JS runtime?

Accepted Answer

Snapshot (Webpack snapshot plugin)

Answer

The V8 Snapshot feature serializes the JavaScript heap after initialization so apps start from a pre-warm state, reducing cold start time significantly.

Question 5

How do you enable console.log output from a NativeScript device in the terminal?

Accepted Answer

Run the app with ns run --log and view output in the same terminal

Answer

When you run `ns run android` or `ns run ios`, console.log statements from the app are automatically printed in the same terminal window.

NativeScript for Mobile App Development Practice Test

NativeScript for Mobile App Development Practice Test

NativeScript for Mobile App Development Performance and Debugging