Senior UI Software Engineer
Senior UI Software Engineer Interview Questions and Answers
Q1. React Coding to implement Stop watch with Start, Stop, Resume, Pause
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
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
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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