What is UpdateLifecycle

What is UpdateLifecycle in React.Js and React Native?

UpdateLifecycle in React.Js and React Native refers to the process of updating the components in a React application. When a component’s state or props change, React triggers a re-render of the component to reflect these changes on the user interface. This process is known as the UpdateLifecycle.

During the UpdateLifecycle, React goes through several phases to update the components efficiently. These phases include shouldComponentUpdate, componentWillUpdate, render, and componentDidUpdate. Each phase plays a crucial role in ensuring that the component updates correctly and efficiently.

The shouldComponentUpdate phase is responsible for determining whether the component should re-render or not. It compares the current props and state with the next props and state to decide if a re-render is necessary. If the shouldComponentUpdate method returns false, the component will not re-render.

The componentWillUpdate phase is called just before the component re-renders. It is often used to perform any necessary preparations before the update, such as fetching new data or updating the component’s state based on the new props.

The render phase is where the component’s UI is updated based on the new props and state. React creates a virtual DOM representation of the component and compares it with the actual DOM to determine the changes that need to be applied.

Finally, the componentDidUpdate phase is called after the component has been re-rendered. It is often used to perform any post-update operations, such as updating the component’s state or interacting with external APIs.

Overall, the UpdateLifecycle in React.Js and React Native is a crucial aspect of building efficient and responsive applications. By understanding how the UpdateLifecycle works and utilizing its phases effectively, developers can ensure that their components update correctly and perform optimally.