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intro to react| React: dynamic UIs, component-based, virtual DOM, JSX, efficient rendering..pptx
- 1. Welcome
- 2. •1. Introduction to React •What is React? •React is a popular JavaScript library developed by Facebook for building user interfaces, particularly for single-page applications. It allows developers to create reusable UI components, manage the state of their applications efficiently, and build complex interfaces by breaking them down into smaller, manageable parts. React uses a declarative approach, which makes the code more predictable and easier to debug. •Key features of React include: Component-Based Architecture: React applications are built using components, which are reusable and independent pieces of UI. Virtual DOM: React uses a virtual representation of the DOM to optimize and minimize the number of updates made to the real DOM, leading to better performance. Unidirectional Data Flow: React enforces a one-way data flow, making the application state more predictable and easier to manage. •History and Evolution •React was first released by Facebook in 2013. It was initially created by Jordan Walke, a software engineer at Facebook, who was inspired by XHP, a component-based HTML framework for PHP. React was introduced as a solution to improve the performance and maintainability of Facebook’s codebase, particularly for their newsfeed feature.
- 3. •Key milestones in React's evolution: 2013: Initial release of React by Facebook. 2015: Introduction of React Native, allowing developers to use React for building mobile applications. 2015: Introduction of JSX, a syntax extension that allows writing HTML within JavaScript, making the code more readable and easier to write. 2017: Introduction of React Fiber, a complete rewrite of the React core algorithm to improve performance, particularly in handling complex UIs. 2018: Introduction of React Hooks, enabling developers to use state and other React features in functional components, making them more powerful and flexible. 2020: Release of React 17, focusing on gradual upgrades and improved compatibility with other versions of React. 2022: Introduction of React 18, which brought new features like automatic batching, concurrent rendering, and the startTransition API for smoother UI updates. •React vs Other Frameworks •React is often compared with other popular front-end frameworks like Angular and Vue.js. Here’s how it stands out:
- 4. React vs Angular: o Learning Curve: React has a relatively lower learning curve compared to Angular. Angular is a full-fledged MVC (Model-View-Controller) framework with a steep learning curve due to its extensive feature set. o Flexibility: React is more flexible as it focuses on the view layer only, allowing developers to integrate it with other libraries or frameworks. Angular is more opinionated and provides everything out of the box, including state management, routing, and form handling. o Performance: Both frameworks are optimized for performance, but React’s use of the Virtual DOM often provides better performance for dynamic UIs. React vs Vue.js: o Community and Ecosystem: React has a larger community and more extensive ecosystem compared to Vue.js. This means more resources, tutorials, and third-party libraries are available for React. o Learning Curve: Vue.js is considered easier to learn for beginners, especially those who are new to JavaScript frameworks. React’s reliance on JavaScript ES6+ features and its ecosystem might present a steeper learning curve for beginners. o Flexibility: Both React and Vue are flexible, but Vue provides a more integrated solution with its own set of tools for state management (Vuex) and routing (Vue Router), while React relies more on third-party libraries. •React’s focus on simplicity, flexibility, and performance has made it a popular choice among developers and companies for building modern web applications. • • •
- 5. •SPAs, or Single Page Applications, are web applications that load a single HTML page and dynamically update that page as the user interacts with the app. Unlike traditional multi-page applications, where each interaction typically loads a new page from the server, SPAs load content dynamically through JavaScript, which helps to create a more fluid and responsive user experience. •Key Features of SPAs: • Single HTML Page: o The application is served as a single HTML page, and additional content is fetched dynamically as needed. • Dynamic Content Loading: o Content is loaded dynamically using JavaScript, usually through AJAX (Asynchronous JavaScript and XML) or Fetch API, allowing the app to update parts of the page without refreshing the entire page. • Client-Side Routing: o SPAs use client-side routing to manage different views or states within the application. This is often handled by libraries or frameworks like React Router, Vue Router, or Angular’s Router. • Improved User Experience: o By avoiding full page reloads, SPAs provide a smoother, faster, and more responsive user experience, often with faster interactions and transitions. • State Management: o SPAs often rely on client-side state management solutions (like Redux, Vuex, or Context API) to manage and synchronize application state. • Back-End API Integration: o SPAs typically interact with back-end services via APIs (often RESTful APIs or GraphQL) to retrieve or send data.
- 6. •Advantages of SPAs: Performance: Faster interactions due to reduced server load and minimized data transfer. User Experience: Smoother transitions and interactions because the page doesn't reload. Reduced Server Load: Only necessary data is requested from the server, rather than reloading entire pages. •Disadvantages of SPAs: SEO Challenges: Since content is dynamically loaded, SPAs can be more challenging to optimize for search engines compared to traditional multi-page applications. Initial Load Time: The initial load may be slower as the application needs to download the entire app’s JavaScript code upfront. Browser History and Navigation: Handling browser history and navigation can be more complex, although modern libraries and frameworks provide solutions for this. •Popular Frameworks and Libraries for SPAs: React: A JavaScript library for building user interfaces, often used with React Router for client-side routing. Angular: A full-fledged framework with built-in support for client-side routing and state management. Vue.js: A progressive JavaScript framework that provides tools for building SPAs, including Vue Router for routing.
- 7. •SPAs are widely used for creating modern web applications due to their performance benefits and improved user experience. •Single Page Applications (SPAs) are web apps that load a single HTML page and dynamically update content without refreshing the page. Key features include: Single HTML Page: The app is served as one page, with content updated dynamically. Dynamic Content Loading: Uses JavaScript (e.g., AJAX, Fetch) to load content as needed. Client-Side Routing: Manages different views or states without full page reloads. Improved User Experience: Provides smoother and faster interactions. State Management: Utilizes client-side solutions to manage app state. Back-End API Integration: Interacts with back-end services via APIs. •Advantages: Faster interactions, smoother user experience, reduced server load. •Disadvantages: SEO challenges, potentially slower initial load time, complex browser history handling. •Popular Frameworks/Libraries: React, Angular, Vue.js. • •