Senior UI Software Engineer

Senior UI Software Engineer Interview Questions and Answers

Updated 22 Mar 2024

Q1. React Coding to implement Stop watch with Start, Stop, Resume, Pause

Ans.

Implement a React stopwatch with start, stop, resume, and pause functionalities.

  • Use state to track the elapsed time

  • Create functions for start, stop, resume, and pause actions

  • Use setInterval for updating the timer every second

  • Display the timer in the UI

Q2. How does memory leak happen in Javascript

Ans.

Memory leaks in JavaScript happen when unused objects are not properly released from memory.

  • Memory leaks can occur when variables are not properly dereferenced, preventing garbage collection.

  • Closures can also lead to memory leaks if they hold references to large objects.

  • Event listeners can cause memory leaks if not removed properly after use.

  • Using setInterval without clearing it can lead to memory leaks.

  • Circular references can also cause memory leaks in JavaScript.

Q3. Error Handling component in React

Ans.

Error handling in React involves creating a component to display error messages and handling errors gracefully.

  • Create an ErrorBoundary component to catch errors in child components.

  • Use try-catch blocks in async functions to handle errors.

  • Display error messages to the user using state or props.

  • Use error boundaries to prevent the entire UI from crashing due to a single error.

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