React is a popular JavaScript library for building user interfaces. One of the key concepts in React is the Component Lifecycle. It refers to the series of methods that are invoked in a particular order when a component is mounted, updated, or unmounted.
Understanding the Component Lifecycle can help you to write more efficient and optimized code. Here's a brief overview of the different phases of the Component Lifecycle:
1- Mounting: The component is created and inserted into the DOM. The following methods are called in order:
constructor()
static getDerivedStateFromProps()
render()
componentDidMount()
2- Updating: The component is re-rendered due to changes in state or props. The following methods are called in order:
static getDerivedStateFromProps()
shouldComponentUpdate()
render()
getSnapshotBeforeUpdate()
componentDidUpdate()
3- Unmounting: The component is removed from the DOM. The following method is called:
componentWillUnmount()
By understanding the Component Lifecycle, you can control the behavior of your components and ensure that they behave in the way that you want them to. Happy coding!
Top comments (1)
It's worth mentioning that these lifecycle methods are only available in legacy class components. Lifecycle methods are not available in React function components, instead you can create a reactive effect with the
useEffecthook: react.dev/learn/lifecycle-of-react...Word of advice: It's best to forget about the old lifecycle methods, trying to apply the old lifecycle method logic to the new useEffect hook will result in bad performance or even bugs.