Could you explain the stages of the React component lifecycle and their purpose?

The lifecycle of a React component consists of several stages that allow managing the creation, updating, and removal of the component:

1. Mounting — the stage when the component is created and inserted into the DOM. Main methods:

   • constructor — initializes state and binds methods.
   • render — returns JSX for display.
   • componentDidMount — called after the component is inserted into the DOM, suitable for API requests or setting up subscriptions.

2. Updating — occurs when props or state change:

   • shouldComponentUpdate — allows optimizing updates by returning true or false.
   • render — re-renders with new data.
   • componentDidUpdate — called after updating, can react to changes.

3. Unmounting — when the component is removed from the DOM:

   • componentWillUnmount — cleans up timers, cancels subscriptions, and other resources.

In functional components with hooks, the lifecycle is managed using useEffect, which can mimic the behavior of class methods.