How to Work with and Manipulate State in React

This article from React Quickly by Azat Mardan provides a concise guide to understanding and manipulating state in React.js. It covers key aspects of state management, highlighting differences between state and props, and advocating for the use of stateless components where appropriate.

The article begins by explaining how to access and render state within JSX using this.state and curly braces {}. It then details how to initialize state within a component's constructor, emphasizing the importance of calling super(props) and using this.state = {...}.

Updating state is covered using this.setState(data, callback), explaining the asynchronous nature of the update and the role of the callback function in ensuring data consistency. The article demonstrates continuous state updates, such as a ticking clock, using setInterval and this.setState.

A key section differentiates state and props: state is mutable and internal to the component, while props are immutable and passed from parent components. The advantages of stateless components—predictable output and easier maintenance—are highlighted, illustrating their use with props for data input and rendering.

The article includes practical examples, such as a clock component that dynamically updates the time, showcasing how to initialize, update, and render state effectively. It also addresses the importance of binding this in JavaScript to ensure correct context within functions.

Finally, the article concludes with a FAQ section answering common questions about state management in React, including initialization, updates, differences between state and props, and usage in both class and functional components.

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