Learn useCallback in 11 Minutes - React Hooks Simplified
In this tutorial we're going to do an in-depth dive of the useCallback hook in React. We'll discuss what useCallback is and how it relates to useMemo, how to implement useCallback in React, and also the possible use cases of useCallback.
useCallback is very similar to useMemo. The difference is that useMemo memoizes the return value of a function, whereas useCallback actually memoizes the function itself.
The purpose of useCallback is to memoize a function so that we don't need to keep redefining that function on every re-render. This has two primary practical use cases in React:
1. It stops you from having to re-render child components if you're passing down a function as props to child.
2. It allows you to define methods OUTSIDE useEffect but call them INSIDE useEffect
Timestamps:
0:00 - What is useCallback?
1:04 - Use Case 1
3:30 - The problem
4:40 - useCallback Solution
6:45 - Use Case 2
7:54 - The problem
9:02 - useCallback Solution
9:58 - Easier Solution (not useCallback)
After this guide, you'll know how to use useCallback in your React projects!
Hashtags:
#chatgpt #python #pythontutorial
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