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3,481 react developer interview questions shared by candidates

1) What is useMemo in React? 2) What is useContext in React JS? 3) When does component Re-render? 4) What is the use of useCallback hook? 5) for(var i=0;i<5;i++){ setTimeout(()=>{ console.log()i; }); } What is the output of the above code? What changes do I need to make to get '0 1 2 3 4' as output. 6) Tell me about any challenge you came across while building a project and how did you solve it?
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React Developer

Interviewed at RioMed

2.7★
Jun 26, 2023

1) What is useMemo in React? 2) What is useContext in React JS? 3) When does component Re-render? 4) What is the use of useCallback hook? 5) for(var i=0;i<5;i++){ setTimeout(()=>{ console.log()i; }); } What is the output of the above code? What changes do I need to make to get '0 1 2 3 4' as output. 6) Tell me about any challenge you came across while building a project and how did you solve it?

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