Instruction: Compare and contrast Class components with Functional components in React.
Context: This question checks the candidate's understanding of the two types of components in React and their respective use cases, focusing on the evolving React paradigms.
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To start with, Class components, as the name suggests, are ES6 classes that extend from React.Component. They are more traditional in React's history and have been the backbone of React applications for a long time. One of their key characteristics is their ability to hold and manage state and lifecycle methods. This includes componentDidMount(), componentDidUpdate(), and componentWillUnmount(), among others, which are crucial for handling side effects, subscriptions, or manually manipulating the DOM.
On the other hand, Functional components are JavaScript functions that return React elements. Initially, they were stateless, meant for simple presentations of UI without managing state or lifecycle. However, with the introduction of Hooks in React 16.8, Functional components have become equally powerful, allowing for state management and side-effect handling within...