useCallback
Explore the useCallback Hook to improve React app performance by memoizing function references. Understand how useCallback works with dependency arrays and React.memo to avoid redundant re-renders, especially when working with PureComponents or components wrapped in React.memo. Learn to manage stable functions across renders to optimize your React components effectively.
We'll cover the following...
What is useCallback()?
The useCallback() Hook can be used to optimize the performance of an application. It receives a function and then creates a unique identity of that function, which will remain active until the dependencies of the Hook itself change.
This is important becasue we need to provide the same reference to a function when:
- Dealing with
PureComponents. - Functions implement their own
shouldComponentUpdate()method. - Functions are wrapped by
React.memo().
The useCallback() Hook expects two parameters. The first is a function and the second is a ...