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React JS is a popular JavaScript library used for building user interfaces. As a beginner in React, it’s important to understand the lifecycle methods of React components. These methods are a set of functions that get called at different points in the process of creating and updating a component.
The component lifecycle can be divided into three main phases:
- Mounting: This phase starts when the component is created and added to the DOM (Document Object Model). It includes the following lifecycle methods:
- componentWillMount
- render
- componentDidMount
- Updating: This phase occurs when the component receives new props or updates its state. It includes the following lifecycle methods:
- componentWillReceiveProps
- shouldComponentUpdate
- componentWillUpdate
- render
- componentDidUpdate
- Unmounting: This phase occurs when the component is removed from the DOM. It includes the following lifecycle method:
- componentWillUnmount
It’s important to understand these lifecycle methods and when they get called because they give you the opportunity to control what happens in your component at different stages of its existence. For example, you can use componentWillMount to set up any data you need for your component, use componentDidUpdate to respond to changes in the component’s props or state, and use componentWillUnmount to clean up after your component when it is no longer needed.
However, it’s also important to keep in mind that not all lifecycle methods are needed in every component. In fact, it’s recommended to avoid using some of the lifecycle methods and instead rely on the newer React hooks for many of these tasks.
In summary, understanding the React component lifecycle is a crucial part of becoming a proficient React developer. It allows you to control the behavior of your components at different stages of their existence and make your React applications more efficient and performant.
React JS for Beginners – Chapter 6: React Component Lifecycle
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