react component life cycle .

Questions are from React js hooks and javascript basic questions

1st round Face-to-Face interview What is promise chaining ? What is difference between asynchronous & synchronous ? what is useeffect hook? what is hoisting ? what is the purpose of key property in react? what is virtual dom? what are three components of Promise ? what is the purpose of useMemo? what is memoization? what is caching? what does map & reduce function do with an array? what is server-side rendering & client-side rendering ? 2nd Technical interview 1. const a = {color:"blue",name:"abc"} b = a b.color = "green" so now will the a will be affected if yes then why? 2. const a = "This is a text" output should be "sihT si a txet" tell me the approach for it How many hooks you have used useEffect basics question what if i removed the dependency array from it what will happen if the dependency array will be missing from the useeffect? Context Api provider question RTK basic questions usedispatch, useSelector