React Native Professional Standards & Competencies 2

Question 1

A React Native app's FlatList renders correctly on iOS but shows blank rows on Android. What is the best first debugging step?

Accepted Answer

Use the React Native Debugger to inspect the FlatList's rendered items and data prop on Android

Answer

Using React Native Debugger to inspect component state and props isolates whether the issue is data, rendering, or platform-specific styling.

Question 2

Which practice best demonstrates professional code ownership in a React Native team?

Accepted Answer

Writing self-reviewing pull requests with context, screenshots, and test evidence

Answer

Self-documented PRs with context and evidence reduce review friction and demonstrate accountability for the change.

Question 3

When estimating a React Native feature involving a new native module, a professional developer should:

Accepted Answer

Include a spike/research phase to assess native bridging complexity before committing

Answer

A spike phase lets the team discover unknown native complexities before committing to a timeline, improving estimate accuracy.

Question 4

A junior developer on your team repeatedly submits PRs without running the linter. The most professional response is to:

Accepted Answer

Add a pre-commit hook that enforces linting automatically and explain why it helps the team

Answer

Automating the constraint removes the human error and explaining the 'why' builds long-term team discipline.

Question 5

Which metric is most professionally relevant when evaluating React Native app performance for end users?

Accepted Answer

Time to Interactive (TTI) measured on mid-range Android devices

Answer

TTI on representative hardware reflects real user experience, not synthetic measures that may not correlate with perceived performance.

React Native Practice Test