React Programming Tutorials, Guides & Best Practices

• How selectors work and why memoization is important.
• Advanced use cases for normalized data.

• Tools like Redux DevTools and best practices for debugging state.
• How to avoid unnecessary renders.

In this example, the square of the number is only recalculated when number changes, avoiding unnecessary computations.

useCallback is used to memoize functions so that they are not re-created on every render unless one of the dependencies changes. This is particularly useful when passing callbacks to child components that rely on referential equality to avoid unnecessary renders.