Flashcards on React JS

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What is React JS and what are its key features?

React JS is a JavaScript library for building user interfaces. Its key features include virtual DOM, reusable components, and JSX syntax.

What is JSX syntax in React JS?

JSX is a syntax extension to JavaScript that allows writing HTML-like elements in code. It makes building and rendering components in React JS more intuitive and easier.

What is the difference between state and props in React JS?

State is an internal data store in a component that can be changed over time. Props, short for properties, are immutable data passed from a parent component to a child component.

What is the significance of React JS virtual DOM?

The virtual DOM in React JS is a lightweight copy of the actual DOM that can be updated without refreshing the whole page. This improves performance and prevents unnecessary re-renders.

What is the role of components in React JS?

Components are reusable building blocks in React JS that can be composed to create complex user interfaces. They can be easily maintained and updated.

What is the difference between functional and class components in React JS?

Functional components are simpler and easier to read, while class components have more features and can be used for more complex applications.

What is Redux and how is it related to React JS?

Redux is a JavaScript library for managing the state of an application. It can be used with React JS to simplify data flow and improve scalability.

What is React Router and why is it useful?

React Router is a library for managing client-side routing in React JS applications. It allows for easy navigation between different components without reloading the page.

What is server-side rendering in React JS and why is it important?

Server-side rendering is the process of rendering a web page on the server instead of the client. It can improve performance and SEO, as well as provide a better user experience for users with slow internet connections.

What are some best practices for optimizing React JS performance?

Some best practices include using immutable data, avoiding unnecessary re-renders, using React's built-in performance tools, and optimizing images and other external assets.

What are some notable companies that use React JS?

Some notable companies that use React JS include Facebook, Instagram, Netflix, and Airbnb.

What are some common mistakes beginners make when learning React JS?

Some common mistakes include overusing state, not using reusable components, not following best practices for component naming and organization, and neglecting to learn JSX syntax.

What are some key differences between React JS and Angular?

React JS is a JavaScript library focused on building user interfaces, while Angular is a full-fledged framework for building web applications. React JS uses a virtual DOM, while Angular uses real DOM manipulation. React JS is more lightweight and easier to learn, while Angular has a steeper learning curve but comes with more built-in features.

What are some alternatives to React JS?

Some alternatives include Vue.js, Angular, Svelte, and Ember.

How can React JS be used in mobile app development?

React Native is a mobile development framework that uses React JS to build natively rendered mobile applications for iOS and Android. It allows for easy code sharing between web and mobile apps.

What is React JS and what are its key features?

React JS is a JavaScript library for building user interfaces. Its key features include virtual DOM, reusable components, and JSX syntax.

What is JSX syntax in React JS?

JSX is a syntax extension to JavaScript that allows writing HTML-like elements in code. It makes building and rendering components in React JS more intuitive and easier.

What is the difference between state and props in React JS?

State is an internal data store in a component that can be changed over time. Props, short for properties, are immutable data passed from a parent component to a child component.

What is the significance of React JS virtual DOM?

The virtual DOM in React JS is a lightweight copy of the actual DOM that can be updated without refreshing the whole page. This improves performance and prevents unnecessary re-renders.

What is the role of components in React JS?

Components are reusable building blocks in React JS that can be composed to create complex user interfaces. They can be easily maintained and updated.

What is the difference between functional and class components in React JS?

Functional components are simpler and easier to read, while class components have more features and can be used for more complex applications.

What is Redux and how is it related to React JS?

Redux is a JavaScript library for managing the state of an application. It can be used with React JS to simplify data flow and improve scalability.

What is React Router and why is it useful?

React Router is a library for managing client-side routing in React JS applications. It allows for easy navigation between different components without reloading the page.

What is server-side rendering in React JS and why is it important?

Server-side rendering is the process of rendering a web page on the server instead of the client. It can improve performance and SEO, as well as provide a better user experience for users with slow internet connections.

What are some best practices for optimizing React JS performance?

Some best practices include using immutable data, avoiding unnecessary re-renders, using React's built-in performance tools, and optimizing images and other external assets.

What are some notable companies that use React JS?

Some notable companies that use React JS include Facebook, Instagram, Netflix, and Airbnb.

What are some common mistakes beginners make when learning React JS?

Some common mistakes include overusing state, not using reusable components, not following best practices for component naming and organization, and neglecting to learn JSX syntax.

What are some key differences between React JS and Angular?

React JS is a JavaScript library focused on building user interfaces, while Angular is a full-fledged framework for building web applications. React JS uses a virtual DOM, while Angular uses real DOM manipulation. React JS is more lightweight and easier to learn, while Angular has a steeper learning curve but comes with more built-in features.

What are some alternatives to React JS?

Some alternatives include Vue.js, Angular, Svelte, and Ember.

How can React JS be used in mobile app development?

React Native is a mobile development framework that uses React JS to build natively rendered mobile applications for iOS and Android. It allows for easy code sharing between web and mobile apps.

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