React useMemo Hook

This template provides a basic example of useMemo hook

useMemo Hook

The React useMemo Hook returns a memoized value. The useMemo Hook only runs when one of its dependencies update.

useMemo Hook vs useEffect Hook

The main difference between useMemo and useEffect hook is that useMemo returns a memoized value and useEffect returns a memoized function

Code Explanation

This code is a React application that demonstrates the usage of the useMemo hooks. It also includes a simple function slowFunc that performs a time-consuming calculation.

Memozied values: Two memoized values are declared using the useMemo hook. These memoized values are computed based on specific dependencies and are cached to avoid unnecessary re-computations.

• result is memoized and represents the result of a time-consuming calculation using the slowFunc function. It depends on the number state.
• styleColors is memoized and represents an object with background and color properties. The values of these properties depend on the dark state.

Overall, this code demonstrates a React application that updates and displays a number while allowing users to change the theme (light or dark). The slowFunc function appears to be a placeholder for demonstrating how useMemo can help avoid unnecessary re-computation of values based on changing dependencies.