Virtusa Lead Engineer interview questions

Virtual interview, Yesterday I appeared in first round, There was mix react.js and javascript question. React: Virtual DOM, useMemo, useCallback, react.memo, Context api, Redux flow, why use useRef not useState, and few more theory questions. Javascript: he asked me to print 9 8 7 4 5 6 1 2 3 This pattern(snake ladder pattern), and clouser(Deep in it), and optput based questions related to clouser by function hoisting. How call works provide example.