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 Copy code (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.
