I applied on LinkedIn and had a first-round interview for React Native Engineer 2 at Zepto. Despite answering most questions well, a minor code mistake might have led to my rejection.

I had an interview at Zepto for the first round. The interviewer asked me several questions, including:

• The use of useMemo and useCallback
• Whether we can render a screen using useRef

They asked me to run this code and explain the output:

javascript (function() { console.log(a); if (true) { var a = 'a'; } console.log(a); console.log(b); const bar = function() { var b = 'b'; console.log(b); }; bar(); console.log(b); })();

They asked about Promises and requested that I write the code for Promise.all as if I were coding before ES6.

They asked about Array.reduce and requested that I write code using prototype.

Finally, they asked me to explain the difference between Array.filter and Array.map.

I honestly answered all the questions, but I made a slight mistake with the code.

I don’t know why I was rejected in the first round of the interview; I was expecting to get selected.