I attended the first round of interview with Zepto. It was an advanced JS round with a bit of React Native basics involved. The questions were good. I completed around 60% and struggled a bit, so I couldn't get through to the next round.

1. Closures and implement it.

2. Output of this: javascript let isFlag = true; setTimeout(() => isFlag = false, 10); while (isFlag) { console.log("hello"); }

3. Shallow copy and deep copy of objects along with an output question.

4. Polyfills.

5. Implement a polyfill for Array.reduce.

6. Implement a missing closure function.

7. Flatten a nested object.

8. Implement a usePrevious custom hook.

9. Difference between useCallback and useMemo.

10. Bridges in React Native.

11. Difference in old and new architecture of React Native.