Medium Analyze React & Next.js multiple_choice

What is the difference between useMemo and useCallback?

Analyze — Tests ability to break down and examine complex problems.

Answer Options

A useMemo caches a value; useCallback caches a function reference

B useMemo is for async operations; useCallback is for sync operations

C They are identical — useCallback is just an alias for useMemo

D useMemo runs on mount only; useCallback runs on every render

Want to see the correct answer?

Get the answer with a detailed explanation, plus practice 15+ more React & Next.js questions with adaptive quizzes and timed interviews.

See the Answer on Guru Sishya →

This question is from the React & Next.js topic (Frontend).

Learn React & Next.js → Browse All Questions

More React & Next.js Questions

What is the primary purpose of the key prop when rendering lists in React?

What is a React Server Component?

Which hook should you use to run code only once when a component mounts?

What does 'use client' do in Next.js App Router?

What does revalidatePath() do in Next.js Server Actions?