Difference between useCallback and useMemo Hooks in React. A defining trait of a seasoned React developer.

A thorough understanding of advanced React hooks, such as useCallback and useMemo, is a prerequisite for any developer striving to achieve senior-level proficiency in React.

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useCallback and useMemo are both optimization hooks in React that are used to improve performance. They work by memorizing values so that they are only recomputed when necessary. However, there are some differences between the two hooks.

useCallback is used for memorizing functions, whereas useMemo is used for memorizing values. The difference is that useCallback returns a memorized function, while useMemo returns a memorized value.

Here are some examples to illustrate the differences between the two hooks:

In this example, useCallback is used to memorize the increment function. This ensures that the function is only recreated when the count state changes, rather than on every render.

Example using useMemo:

In this example, useMemo is used to memorize the result of the calculateFactorial function. This ensures that the function is only called when the n prop changes, rather than on every render.

In summary, useCallback is used for memorizing functions, while useMemo is used for memorizing values. Both hooks are useful for optimizing performance in larger React applications

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