Memoization is a technique used in programming to cache the results of expensive function calls. It avoids re-calculating the same result multiple times, leading to performance improvements.
In React, memoization can be used to:
Optimize pure components: If a component is pure (meaning its output depends solely on its props), you can memoize it using React.memo to avoid unnecessary re-renders.
Optimize custom hooks: Memoize custom hooks that perform expensive calculations or fetch data.
Example:
In this example, the ExpensiveComponent is memoized using React.memo. This means that if the props passed to the component don't change, the component won't re-render, avoiding unnecessary calculations.
By using memoization, you can optimize your React components and improve the performance of your application.