title
React Interview Questions and Answers | React Tutorial | React Redux Online Training | Edureka

description
🔥 Edureka ReactJS Training - https://www.edureka.co/reactjs-redux-certification-training This Edureka video on React Interview Questions and Answers will help you to prepare yourself for React Interviews. Learn about the most important React interview questions and answers and know what will set you apart in the interview process. This video helps you to learn following topics: 1. General React 2. React Components 3. React Redux 4. React Router Subscribe to our channel to get video updates. Hit the subscribe button above. 🔥 Full-Stack Web Development Internship Program: http://bit.ly/fs-internship #ReactJS #ReactJSTutorial #ReactTutorial #ReactJSOnlineTraining #ReactJSforbeginners #ReactJSFramework #ReactRedux #ReactRouter #ReactComponents #ReactInterviewQuestions ----------------------------------------------------------------- How it Works? 1. This is a 4 Week Instructor-led Online Course, 30 hours of assignment and 20 hours of project work. 2. We have a 24x7 One-on-One LIVE Technical Support to help you with any problems you might face or any clarifications you may require during the course. 3. At the end of the training you will be working on a real time project for which we will provide you a Grade and a Verifiable Certificate! -------------------------------------------------------------------- About The Course ReactJS with Redux course at Edureka is designed to skill you into a successful Client-Side Application Developer. You'll master the concepts of ReactJS including its Architecture and components. The course also focuses on Testing Redux, React Router, React Redux, JSX, Data Flow & Usage with React, Async Actions & Flow and React Middleware thereby making you completely ready to build ReactJS applications effectively. ---------------------------------------------------------------------- Who should go for this course? The following professionals can go for this ReactJS with Redux course: UI Developers and Technical Leads Developers upgrading from AngularJS, EmberJS or other similar UI Javascript frameworks Freshers and aspiring UI (JavaScript) developers Full Stack Developers QAs, Architects, and Technical Project Managers ----------------------------------------------------------------------- Why learn ReactJS? The ReactJS with Redux certification training course is designed to provide knowledge and skills to become a successful Client-Side Application Developer. It starts with the fundamental concepts of ReactJS and its ecosystem. The training then focuses on Redux and its features and then, later on, demonstrates how React and Redux can be used together to build extensive applications. ReactJS latest version is 15.x. The few key features include no active support for IE8, better support for SVG, faster processing in browsers and cleaner output for DOM. This is in comparison to its earlier version 14.x. Redux framework has been continuously evolving and providing more stronger support with React. For more information, please write back to us at sales@edureka.co or call us at IND: 9606058406 / US: 18338555775 (toll free). Facebook: https://www.facebook.com/edurekaIN/ Twitter: https://twitter.com/edurekain LinkedIn: https://www.linkedin.com/company/edureka

detail
{'title': 'React Interview Questions and Answers | React Tutorial | React Redux Online Training | Edureka', 'heatmap': [{'end': 1094.666, 'start': 1038.54, 'weight': 0.701}], 'summary': 'Explores the market reach and impact of react.js, its fundamentals, jsx transformation, lifecycle methods, transitioning from mvc to flux and redux, and redux in react and react router, emphasizing its growth as a popular front-end javascript library, features, and advantages for developers.', 'chapters': [{'end': 198.451, 'segs': [{'end': 30.301, 'src': 'embed', 'start': 0.233, 'weight': 6, 'content': [{'end': 6.279, 'text': 'Hello, everyone, and welcome to a webinar from Edureka on React interview questions.', 'start': 0.233, 'duration': 6.046}, {'end': 8.881, 'text': 'A brief introduction about me.', 'start': 7.54, 'duration': 1.341}, {'end': 14.727, 'text': 'My name is Vipul Jain, and I have total seven years of experience in SharePoint, .', 'start': 9.382, 'duration': 5.345}, {'end': 21.253, 'text': 'NET, Office 365, and client-side libraries like jQuery, JavaScript, AngularJS, and ReactJS.', 'start': 14.727, 'duration': 6.526}, {'end': 23.659, 'text': 'In this particular webinar,', 'start': 22.219, 'duration': 1.44}, {'end': 30.301, 'text': 'I talk about the interview questions which could be asked or might be asked when you will face an interview for React Chairs.', 'start': 23.659, 'duration': 6.642}], 'summary': 'Vipul jain, with seven years of experience, discusses react interview questions in this edureka webinar.', 'duration': 30.068, 'max_score': 0.233, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA233.jpg'}, {'end': 155.593, 'src': 'embed', 'start': 44.224, 'weight': 0, 'content': [{'end': 51.317, 'text': 'So if I talk about React, React is front-end JavaScript library which was developed by Facebook in 2013.', 'start': 44.224, 'duration': 7.093}, {'end': 54.72, 'text': 'It is an open source library and follows the component based approach.', 'start': 51.317, 'duration': 3.403}, {'end': 62.726, 'text': 'So we all know that in React Chairs there are components and as we all say that everything is a component in React Chairs.', 'start': 55.32, 'duration': 7.406}, {'end': 69.331, 'text': 'So Facebook deployed React in its news feed in 2011 which improved its UI drastically.', 'start': 63.326, 'duration': 6.005}, {'end': 74.735, 'text': 'So before 2011 if I talk about Facebook was not using React Chairs in its Facebook application.', 'start': 69.651, 'duration': 5.084}, {'end': 84.232, 'text': 'But after 2011, it started using React.js and drastically the UI part or the performance part of the Facebook application got improved.', 'start': 75.285, 'duration': 8.947}, {'end': 87.534, 'text': "And it's maintained by Facebook and Instagram.", 'start': 84.972, 'duration': 2.562}, {'end': 90.796, 'text': 'So Facebook and Instagram are the main applications nowadays.', 'start': 87.554, 'duration': 3.242}, {'end': 95.1, 'text': 'There are many other like Uber which are using React.js in their applications.', 'start': 90.836, 'duration': 4.264}, {'end': 103.686, 'text': 'So specifically if I talk about Facebook application as of now, the newsfeed part, the comment part, they are being developed in React.js precisely.', 'start': 95.8, 'duration': 7.886}, {'end': 105.466, 'text': 'Now react job trends.', 'start': 104.485, 'duration': 0.981}, {'end': 113.477, 'text': 'if I talk about react job trends, job trends in India and job trends in USA, as you can see on the screen that these are the various portals,', 'start': 105.466, 'duration': 8.011}, {'end': 122.571, 'text': 'I will say in India, which provides the jobs, that these are the number of job posting for professionals on various job portals as on September 2017..', 'start': 113.477, 'duration': 9.094}, {'end': 123.672, 'text': 'Now React job trends.', 'start': 122.571, 'duration': 1.101}, {'end': 130.476, 'text': 'if I talk about React job vacancy trend, as you can see, that means how much it has been increased with respect to React.', 'start': 123.672, 'duration': 6.804}, {'end': 140.582, 'text': 'if I talk about from 2014 to 15,, 16, and 17,, that how much the React reach has been increased among the developers or the React.js community.', 'start': 130.476, 'duration': 10.106}, {'end': 142.346, 'text': "So let's get started.", 'start': 141.425, 'duration': 0.921}, {'end': 146.588, 'text': 'That was a just brief introduction about the React.js and how much it is famous.', 'start': 142.466, 'duration': 4.122}, {'end': 151.851, 'text': 'If you want to cross-check it or verify it, you can always see that.', 'start': 146.688, 'duration': 5.163}, {'end': 155.593, 'text': "since it's an open source library available, you can always see that.", 'start': 151.851, 'duration': 3.742}], 'summary': "React.js, developed by facebook in 2013, drastically improved ui and performance of facebook's news feed. job postings for react professionals increased from 2014 to 2017 in india and the usa.", 'duration': 111.369, 'max_score': 44.224, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA44224.jpg'}, {'end': 203.134, 'src': 'embed', 'start': 176.56, 'weight': 7, 'content': [{'end': 181.062, 'text': "Then specifically to React.js, I'll talk about React components interview questions.", 'start': 176.56, 'duration': 4.502}, {'end': 187.466, 'text': 'Then we will talk about React Redux interview questions related to React and Redux, that why it is required.', 'start': 181.602, 'duration': 5.864}, {'end': 191.148, 'text': "And then lastly, we'll talk about React router interview questions.", 'start': 187.846, 'duration': 3.302}, {'end': 193.529, 'text': "So let's get started with the general React questions.", 'start': 191.208, 'duration': 2.321}, {'end': 197.391, 'text': 'The first question what is React and why it is required?', 'start': 194.309, 'duration': 3.082}, {'end': 198.451, 'text': 'What is React.js?', 'start': 197.451, 'duration': 1}, {'end': 203.134, 'text': "So the answer for this particular question is that it's a front-end JavaScript library.", 'start': 199.092, 'duration': 4.042}], 'summary': 'React.js interview questions cover components, redux, and router. react is a front-end javascript library.', 'duration': 26.574, 'max_score': 176.56, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA176560.jpg'}], 'start': 0.233, 'title': 'React.js impact and job trends', 'summary': "Explores react's market reach, development history, and impact on facebook's ui, highlighting its rise as a popular front-end javascript library. it also discusses the usage of react.js in applications like facebook, job trends in india and the usa, and outlines the increased reach of react.js among developers from 2014 to 2017.", 'chapters': [{'end': 90.796, 'start': 0.233, 'title': 'React interview questions', 'summary': "Explores react's market reach, development history, and impact on facebook's ui, highlighting its rise as a popular front-end javascript library and its significant improvement in facebook's ui after deployment in 2011.", 'duration': 90.563, 'highlights': ["React is a front-end JavaScript library developed by Facebook in 2013 and has become very popular in the developer's community, with Facebook deploying it in its news feed in 2011, resulting in significant UI improvements for the application.", 'Facebook and Instagram are the main applications maintaining React, with React following a component-based approach and being open source, making it a widely used and influential library in the market.', 'Vipul Jain, with seven years of experience in SharePoint, .NET, Office 365, jQuery, JavaScript, AngularJS, and ReactJS, provides insights into React interview questions and its relevance in the current market.']}, {'end': 130.476, 'start': 90.836, 'title': 'React.js job trends and usage', 'summary': 'Discusses the usage of react.js in applications like facebook, particularly in the newsfeed and comment sections, and presents job trends in india and the usa, indicating the increase in react job vacancies.', 'duration': 39.64, 'highlights': ['The newsfeed and comment sections of Facebook are being developed in React.js.', 'There is an increase in React job vacancies in both India and the USA.', 'The number of job postings for React professionals on various portals in India was observed as of September 2017.']}, {'end': 198.451, 'start': 130.476, 'title': 'React.js interview questions 2014-2017', 'summary': 'Outlines the increased reach of react.js among developers from 2014 to 2017, discusses the popularity of react.js on platforms like github, and introduces a webinar covering general react questions, react components, react redux, and react router interview questions.', 'duration': 67.975, 'highlights': ['The increased reach of React.js among developers from 2014 to 2017 is discussed.', 'The popularity of React.js on platforms like GitHub and other websites is mentioned.', 'An upcoming webinar covering general React questions, React components, React Redux, and React router interview questions is introduced.']}], 'duration': 198.218, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA233.jpg', 'highlights': ["React is a front-end JavaScript library developed by Facebook in 2013 and has become very popular in the developer's community, with Facebook deploying it in its news feed in 2011, resulting in significant UI improvements for the application.", 'There is an increase in React job vacancies in both India and the USA.', 'The newsfeed and comment sections of Facebook are being developed in React.js.', 'Facebook and Instagram are the main applications maintaining React, with React following a component-based approach and being open source, making it a widely used and influential library in the market.', 'The increased reach of React.js among developers from 2014 to 2017 is discussed.', 'The popularity of React.js on platforms like GitHub and other websites is mentioned.', 'Vipul Jain, with seven years of experience in SharePoint, .NET, Office 365, jQuery, JavaScript, AngularJS, and ReactJS, provides insights into React interview questions and its relevance in the current market.', 'An upcoming webinar covering general React questions, React components, React Redux, and React router interview questions is introduced.', 'The number of job postings for React professionals on various portals in India was observed as of September 2017.']}, {'end': 604.846, 'segs': [{'end': 256.142, 'src': 'embed', 'start': 215.22, 'weight': 0, 'content': [{'end': 223.277, 'text': 'It was adapted by Facebook in 2011, although it started as an open source project in 2009, but Facebook accepted it in 2011.', 'start': 215.22, 'duration': 8.057}, {'end': 225.702, 'text': 'and it basically follows a component based approach.', 'start': 223.277, 'duration': 2.425}, {'end': 230.552, 'text': 'This is very important point to understand that ReactJS follows component based approach.', 'start': 225.722, 'duration': 4.83}, {'end': 234.2, 'text': 'The other thing is that it allows to create reusable UI components.', 'start': 230.973, 'duration': 3.227}, {'end': 236.307, 'text': 'And why it is used?', 'start': 235.006, 'duration': 1.301}, {'end': 240.51, 'text': 'It is used to develop complex interactive web as well as mobile UI.', 'start': 236.387, 'duration': 4.123}, {'end': 246.375, 'text': 'It got open source in 2015, and then it has strong foundation and very large community base.', 'start': 241.031, 'duration': 5.344}, {'end': 252.399, 'text': 'If you go to GitHub and other communities, if you see or search for React.js communities,', 'start': 246.735, 'duration': 5.664}, {'end': 256.142, 'text': 'it has a very strong base and strong foundation with respect to React.js.', 'start': 252.399, 'duration': 3.743}], 'summary': 'Reactjs, adopted by facebook in 2011, follows a component-based approach and is used for developing complex interactive web and mobile ui. it became open source in 2015 and has a strong foundation and large community base.', 'duration': 40.922, 'max_score': 215.22, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA215220.jpg'}, {'end': 308.503, 'src': 'embed', 'start': 278.148, 'weight': 3, 'content': [{'end': 279.949, 'text': 'which uses the general or the real DOM.', 'start': 278.148, 'duration': 1.801}, {'end': 287.674, 'text': 'React.js uses a virtual DOM and only the changes which are done from the application standpoint gets reflected,', 'start': 280.85, 'duration': 6.824}, {'end': 290.156, 'text': 'and then the virtual DOM takes care of each and everything.', 'start': 287.674, 'duration': 2.482}, {'end': 299.101, 'text': 'The other thing is it does server-side rendering, and the most important one is the follows unidirectional data flow, that is one-way data binding,', 'start': 290.558, 'duration': 8.543}, {'end': 303.422, 'text': 'which says all the data binding, or the data flow happens in one direction only.', 'start': 299.101, 'duration': 4.321}, {'end': 308.503, 'text': 'The other question is that list some of the major advantages of React.', 'start': 303.462, 'duration': 5.041}], 'summary': 'React.js uses virtual dom, server-side rendering, and unidirectional data flow for efficient and one-way data binding.', 'duration': 30.355, 'max_score': 278.148, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA278148.jpg'}, {'end': 348.336, 'src': 'embed', 'start': 320.612, 'weight': 4, 'content': [{'end': 326.677, 'text': 'Application performance will be highly optimized or highly increased if you are going to use ReactJS in your application.', 'start': 320.612, 'duration': 6.065}, {'end': 329.38, 'text': 'It can be used on client as well as server side.', 'start': 327.238, 'duration': 2.142}, {'end': 330.841, 'text': 'Readability is improved.', 'start': 329.56, 'duration': 1.281}, {'end': 335.285, 'text': 'It is very easy to integrate and easy to write UI test cases.', 'start': 331.201, 'duration': 4.084}, {'end': 339.809, 'text': 'This is very important that ReactJS is very easy to integrate with other libraries.', 'start': 335.365, 'duration': 4.444}, {'end': 340.99, 'text': 'For example, AngularJS.', 'start': 339.849, 'duration': 1.141}, {'end': 342.331, 'text': 'For example, Meteor.', 'start': 341.37, 'duration': 0.961}, {'end': 348.336, 'text': 'Since AngularJS is complete MVC framework and ReactJS is only a few part of the MVC framework as we all know.', 'start': 342.351, 'duration': 5.985}], 'summary': 'Using reactjs can greatly optimize application performance, improve readability, and easily integrate with other libraries like angularjs and meteor.', 'duration': 27.724, 'max_score': 320.612, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA320612.jpg'}, {'end': 498.261, 'src': 'embed', 'start': 468.311, 'weight': 5, 'content': [{'end': 472.272, 'text': "So it's a lightweight JavaScript object which is a copy of the real DOM.", 'start': 468.311, 'duration': 3.961}, {'end': 474.253, 'text': 'It works in three simple steps.', 'start': 472.732, 'duration': 1.521}, {'end': 475.794, 'text': "How virtual DOM works, let's see.", 'start': 474.313, 'duration': 1.481}, {'end': 482.317, 'text': 'So whenever any underlying data changes, the entire UI is re-rendered in virtual DOM representation.', 'start': 476.094, 'duration': 6.223}, {'end': 486.959, 'text': 'And the difference between the previous DOM representation and the new one is calculated.', 'start': 482.877, 'duration': 4.082}, {'end': 493.675, 'text': 'And once all the calculations are done, the real DOM will be updated with only the things that have actually changed.', 'start': 487.439, 'duration': 6.236}, {'end': 498.261, 'text': 'So, which means that the real DOM and the changes which are done.', 'start': 494.156, 'duration': 4.105}], 'summary': 'Virtual dom is a lightweight javascript object that updates the ui efficiently by only changing what has actually changed.', 'duration': 29.95, 'max_score': 468.311, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA468311.jpg'}], 'start': 199.092, 'title': 'Reactjs fundamentals and features', 'summary': "Introduces reactjs as a front-end javascript library developed by facebook, highlighting its component-based approach, reusable ui components, and open source release in 2015. it also discusses react's features including virtual dom and server-side rendering, advantages such as increased application performance, and limitations like large library size and difficulty for novice programmers.", 'chapters': [{'end': 256.142, 'start': 199.092, 'title': 'Introduction to reactjs', 'summary': 'Explains that reactjs is a front-end javascript library developed by facebook in 2011, following a component-based approach, allowing the creation of reusable ui components, and used to develop complex interactive web and mobile ui, with an open source release in 2015 and a strong foundation and large community base.', 'duration': 57.05, 'highlights': ['ReactJS is a front-end JavaScript library developed by Facebook in 2011, following a component-based approach.', 'It allows the creation of reusable UI components.', 'It is used to develop complex interactive web and mobile UI.', 'It was open-sourced in 2015, and has a strong foundation and large community base.']}, {'end': 604.846, 'start': 257.062, 'title': 'React features, advantages, and limitations', 'summary': 'Discusses the main features of react including virtual dom, server-side rendering, and unidirectional data flow, highlighting the major advantages such as increased application performance and ease of integration, and outlining the limitations such as its large library size and difficulty for novice programmers, also explaining jsx and virtual dom working and differentiation from real dom.', 'duration': 347.784, 'highlights': ['Main Features of React React uses virtual DOM, server-side rendering, and follows unidirectional data flow, ensuring optimized application performance and one-way data binding.', 'Advantages of React React increases application performance, is easy to integrate with other libraries like AngularJS and Meteor, improves readability, and simplifies writing UI test cases.', "Limitations of React React's limitations include its large library size, difficulty for novice programmers to understand, and the use of inline templating in JSX.", 'Virtual DOM Working Virtual DOM re-renders the entire UI with underlying data changes, calculates the differences with the previous DOM representation, and updates the real DOM with only the changes.', 'Differentiation between Real DOM and Virtual DOM Virtual DOM updates faster, has minimal DOM manipulation expense, and no memory wastage, while real DOM updates slower, incurs expensive DOM manipulation, and leads to memory wastage.']}], 'duration': 405.754, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA199092.jpg', 'highlights': ['ReactJS is a front-end JavaScript library developed by Facebook in 2011, following a component-based approach.', 'It allows the creation of reusable UI components.', 'It was open-sourced in 2015, and has a strong foundation and large community base.', 'Main Features of React React uses virtual DOM, server-side rendering, and follows unidirectional data flow, ensuring optimized application performance and one-way data binding.', 'Advantages of React React increases application performance, is easy to integrate with other libraries like AngularJS and Meteor, improves readability, and simplifies writing UI test cases.', 'Virtual DOM Working Virtual DOM re-renders the entire UI with underlying data changes, calculates the differences with the previous DOM representation, and updates the real DOM with only the changes.']}, {'end': 1070.666, 'segs': [{'end': 675.612, 'src': 'embed', 'start': 630.562, 'weight': 0, 'content': [{'end': 632.504, 'text': 'So we have JSX transformers in place.', 'start': 630.562, 'duration': 1.942}, {'end': 634.245, 'text': 'Like for example, Babel.', 'start': 633.224, 'duration': 1.021}, {'end': 639.716, 'text': 'Before reaching to browser, JSX needs to be converted with the help of a JSX transformer.', 'start': 634.955, 'duration': 4.761}, {'end': 648.938, 'text': 'So as you can see on the screen, if you have a JSX file, and if you want to show this JSX file on the browser, it cannot be rendered directly.', 'start': 640.416, 'duration': 8.522}, {'end': 653.238, 'text': 'You cannot render a JSX file directly on the browser in React.js.', 'start': 649.178, 'duration': 4.06}, {'end': 657.379, 'text': 'First you have to transform it with the help of a JSX transformer.', 'start': 653.738, 'duration': 3.641}, {'end': 659.319, 'text': 'This is a JSX transformer.', 'start': 657.759, 'duration': 1.56}, {'end': 666.759, 'text': 'Then it gets converted to a JavaScript object And, as we all know, that the browser only knows the JavaScript object,', 'start': 660.02, 'duration': 6.739}, {'end': 668.542, 'text': 'so this can be read on the browser then.', 'start': 666.759, 'duration': 1.783}, {'end': 675.612, 'text': 'So JSX file is converted to JS object by JSX transformer like Babel before reaching to the browser.', 'start': 669.163, 'duration': 6.449}], 'summary': 'Jsx files are converted to javascript objects using jsx transformers like babel before rendering in the browser.', 'duration': 45.05, 'max_score': 630.562, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA630562.jpg'}, {'end': 758.362, 'src': 'embed', 'start': 733.851, 'weight': 2, 'content': [{'end': 740.337, 'text': 'How that converted to ES6 that we have a class keyword now which extends react.component.', 'start': 733.851, 'duration': 6.486}, {'end': 744.04, 'text': 'This is the difference over here in ES5 and ES6.', 'start': 740.717, 'duration': 3.323}, {'end': 747.804, 'text': 'So please remember in ES5 we used to have react.createClass.', 'start': 744.361, 'duration': 3.443}, {'end': 752.075, 'text': 'And ES6 we are using a class keyword which extends react.component.', 'start': 748.291, 'duration': 3.784}, {'end': 756.259, 'text': 'This is a basic difference between ES5 to ES6 class refactoring.', 'start': 752.115, 'duration': 4.144}, {'end': 758.362, 'text': "Let's move forward to other questions.", 'start': 756.86, 'duration': 1.502}], 'summary': 'Es5 used react.createclass, es6 uses class extending react.component', 'duration': 24.511, 'max_score': 733.851, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA733851.jpg'}, {'end': 820.634, 'src': 'embed', 'start': 794.657, 'weight': 3, 'content': [{'end': 802.279, 'text': 'So just like ng-app, ng-data, and you have to provide complete model view controller basics while creating an Angular application.', 'start': 794.657, 'duration': 7.622}, {'end': 805.181, 'text': 'In ReactJS, you handle only the view part.', 'start': 802.699, 'duration': 2.482}, {'end': 812.687, 'text': 'So if I cut out the model, if I cut out the controller, we are left with the view part, which is the basic functionality of ReactJS.', 'start': 805.482, 'duration': 7.205}, {'end': 814.409, 'text': 'This is the most important difference.', 'start': 812.847, 'duration': 1.562}, {'end': 820.634, 'text': 'If I talk about the rendering part, it uses SSR kind of rendering and AngularJS uses CSR kind of rendering.', 'start': 814.429, 'duration': 6.205}], 'summary': 'Angular requires complete mvc basics, while react focuses only on view. react uses ssr rendering, angular uses csr.', 'duration': 25.977, 'max_score': 794.657, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA794657.jpg'}, {'end': 879.497, 'src': 'embed', 'start': 835.489, 'weight': 4, 'content': [{'end': 841.01, 'text': 'If I talk about the data binding also, we discussed that ReactJS follows one-way data binding or data flow.', 'start': 835.489, 'duration': 5.521}, {'end': 843.971, 'text': 'That is from parent to child, this is a one-way binding.', 'start': 841.03, 'duration': 2.941}, {'end': 848.792, 'text': "But AngularJS follows two-way data binding, which is, again, sometimes very expensive, I'd say.", 'start': 844.251, 'duration': 4.541}, {'end': 856.793, 'text': 'If I talk about debugging differences, the debugging in ReactJS is done at compile time, and for AngularJS, it is done at runtime.', 'start': 849.172, 'duration': 7.621}, {'end': 861.274, 'text': 'Now, if I talk about the authors, as we all know, ReactJS is introduced by Facebook.', 'start': 857.333, 'duration': 3.941}, {'end': 863.633, 'text': 'and AngularJS is from Google.', 'start': 861.673, 'duration': 1.96}, {'end': 867.974, 'text': 'So these are the basic differences between AngularJS and ReactJS.', 'start': 863.953, 'duration': 4.021}, {'end': 872.355, 'text': 'So these were the questions related to ReactJS.', 'start': 869.235, 'duration': 3.12}, {'end': 877.156, 'text': "I'll say these were the general questions or basic questions which are asked nowadays in any of the interviews,", 'start': 872.455, 'duration': 4.701}, {'end': 879.497, 'text': "if you're going to face based on the ReactJS.", 'start': 877.156, 'duration': 2.341}], 'summary': 'Reactjs has one-way data binding, while angularjs has two-way data binding, with debugging differences in compile time vs. runtime. reactjs is introduced by facebook, and angularjs is from google.', 'duration': 44.008, 'max_score': 835.489, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA835489.jpg'}], 'start': 605.626, 'title': 'Jsx transformation and react vs angular', 'summary': 'Discusses the process of jsx transformation, syntax changes from es5 to es6, and key differences between react.js and angular.js, including architecture, rendering, dom, data binding, debugging, and authors.', 'chapters': [{'end': 758.362, 'start': 605.626, 'title': 'Jsx transformation and es5 to es6 class refactoring', 'summary': "Discusses why browsers can't read jsx, the process of jsx transformation using jsx transformers like babel, and the changes in syntax from es5 to es6, including the shift from using react.createclass to using the class keyword which extends react.component.", 'duration': 152.736, 'highlights': ["Browsers can't read JSX and need JSX transformers like Babel for conversion to JavaScript objects before rendering, enabling the JSX file to be read by the browser. Browsers can only read JavaScript objects and not JSX, so JSX files need to be converted to JavaScript objects using JSX transformers like Babel before rendering on the browser.", 'The process of transforming JSX files involves using JSX transformers like Babel, which convert JSX files to JavaScript objects before they can be rendered on the browser. JSX files are transformed into JavaScript objects with the help of JSX transformers like Babel, enabling them to be read by the browser.', 'The shift from ES5 to ES6 involves changing the syntax from using react.createClass to using the class keyword which extends react.component, representing a fundamental difference in class refactoring. The transition from ES5 to ES6 involves replacing react.createClass with the class keyword that extends react.component, representing a significant change in syntax and class refactoring.']}, {'end': 1070.666, 'start': 758.802, 'title': 'React vs angular: key differences', 'summary': 'Discusses the key differences between react.js and angular.js, including architecture, rendering, dom, data binding, debugging, and authors, with react focusing on view part, using virtual dom, one-way data binding, compile time debugging, and introduced by facebook, whereas angular uses real dom, two-way data binding, runtime debugging, and is developed by google.', 'duration': 311.864, 'highlights': ['React focuses on view part, using virtual DOM, one-way data binding ReactJS handles only the view part, uses virtual DOM, and follows one-way data binding.', 'Angular uses real DOM, two-way data binding, runtime debugging AngularJS still uses real DOM, follows two-way data binding, and debugging is done at runtime.', 'Compile time debugging for ReactJS Debugging in ReactJS is done at compile time.', 'Introduced by Facebook vs Developed by Google ReactJS is introduced by Facebook, whereas AngularJS is from Google.']}], 'duration': 465.04, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA605626.jpg', 'highlights': ["Browsers can't read JSX and need JSX transformers like Babel for conversion to JavaScript objects before rendering.", 'The process of transforming JSX files involves using JSX transformers like Babel, which convert JSX files to JavaScript objects before they can be rendered.', 'The shift from ES5 to ES6 involves changing the syntax from using react.createClass to using the class keyword which extends react.component.', 'React focuses on view part, using virtual DOM, one-way data binding.', 'Angular uses real DOM, two-way data binding, runtime debugging.', 'Compile time debugging for ReactJS.', 'ReactJS is introduced by Facebook, whereas AngularJS is from Google.']}, {'end': 1695.178, 'segs': [{'end': 1126.171, 'src': 'embed', 'start': 1094.726, 'weight': 0, 'content': [{'end': 1095.526, 'text': 'They are read-only.', 'start': 1094.726, 'duration': 0.8}, {'end': 1098.508, 'text': 'They are pure, which means they are immutable.', 'start': 1095.966, 'duration': 2.542}, {'end': 1099.768, 'text': 'We cannot change them.', 'start': 1098.908, 'duration': 0.86}, {'end': 1103.47, 'text': 'And always passed down from parent to child component.', 'start': 1100.308, 'duration': 3.162}, {'end': 1109.653, 'text': "Why I'm saying this? Because as we all know, that React.js follows a unidirectional data flow.", 'start': 1103.83, 'duration': 5.823}, {'end': 1112.782, 'text': 'or a unidirectional data binding.', 'start': 1110.24, 'duration': 2.542}, {'end': 1118.546, 'text': "So that's why these props are always passed down from parent to child component.", 'start': 1113.402, 'duration': 5.144}, {'end': 1121.027, 'text': 'And they are used to render dynamic data.', 'start': 1119.206, 'duration': 1.821}, {'end': 1126.171, 'text': "Yes, I'll say that this is pretty much very well said that used to render the dynamic data.", 'start': 1121.047, 'duration': 5.124}], 'summary': 'React.js props are immutable, passed parent to child, used for rendering dynamic data.', 'duration': 31.445, 'max_score': 1094.726, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA1094726.jpg'}, {'end': 1428.379, 'src': 'embed', 'start': 1405.883, 'weight': 1, 'content': [{'end': 1413.854, 'text': 'So using this.setState function, you can change the state of the component So as you can see here on the right hand side, there is a code snippet.', 'start': 1405.883, 'duration': 7.971}, {'end': 1416.775, 'text': "Again, I'm using the ES6 class standards.", 'start': 1413.974, 'duration': 2.801}, {'end': 1421.357, 'text': 'So as you can see here, this dot state is having the name Max and ID.', 'start': 1416.915, 'duration': 4.442}, {'end': 1428.379, 'text': "In the render, this dot set state, I'm changing the name as Jueha and ID is 2222.", 'start': 1421.717, 'duration': 6.662}], 'summary': 'Using this.setstate to change component state; name changed to jueha, id to 2222', 'duration': 22.496, 'max_score': 1405.883, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA1405883.jpg'}, {'end': 1542.845, 'src': 'embed', 'start': 1513.33, 'weight': 2, 'content': [{'end': 1518.191, 'text': 'So stateful components are those which stores information about component state change in memory.', 'start': 1513.33, 'duration': 4.861}, {'end': 1522.18, 'text': 'Stateless are they calculate the internal state of the components.', 'start': 1518.899, 'duration': 3.281}, {'end': 1525.601, 'text': 'Stateful components, they have authority to change the state.', 'start': 1522.9, 'duration': 2.701}, {'end': 1532.082, 'text': 'As the name suggests, stateless components cannot have authority, they do not have authority to change the state.', 'start': 1526.261, 'duration': 5.821}, {'end': 1538.104, 'text': 'If I talk about stateful component, they contains the knowledge of past, current, and possible future changes in state.', 'start': 1532.782, 'duration': 5.322}, {'end': 1542.845, 'text': 'Stateless components, they contains no knowledge of past, current, and possible future state changes.', 'start': 1538.564, 'duration': 4.281}], 'summary': 'Stateful components store state change, while stateless calculate internal state.', 'duration': 29.515, 'max_score': 1513.33, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA1513330.jpg'}], 'start': 1070.666, 'title': 'React.js basics and lifecycle methods', 'summary': 'Covers the basics of react.js, including state and props usage, updating state, arrow functions, stateful vs stateless components, and react component lifecycle methods, emphasizing the use of setstate, differences between stateful and stateless components, and the variety of lifecycle methods.', 'chapters': [{'end': 1118.546, 'start': 1070.666, 'title': 'Understanding props in react.js', 'summary': "Discusses the concept of props in react.js, highlighting that props are read-only, immutable, and always passed down from parent to child components due to react.js's unidirectional data flow.", 'duration': 47.88, 'highlights': ['Props in React.js are read-only and immutable, ensuring that they cannot be changed.', 'Props are always passed down from parent to child components in React.js due to its unidirectional data flow.', 'In React.js, props are a short form for properties and serve as the properties for a particular HTML element.']}, {'end': 1695.178, 'start': 1119.206, 'title': 'React.js basics and lifecycle methods', 'summary': 'Covers the basics of react.js, including the use of state and props, updating state, arrow functions, stateful vs stateless components, and the different phases of react component lifecycle, with key points such as the use of setstate to update state, the differences between stateful and stateless components, and the various lifecycle methods in react.js.', 'duration': 575.972, 'highlights': ["The use of setState to update the state of React components Using this.setState function, the state of the component can be changed, for example, changing the name to 'Jueha' and ID to 2222.", 'Differences between stateful and stateless components Stateful components store information about component state change in memory and have authority to change the state, while stateless components calculate the internal state of the components and do not have authority to change the state.', 'Explanation of the different phases of React component lifecycle The initial phase includes functions such as get default props, get initial state, component will mount, render, and component did mount; the updating phase includes functions such as render, and the unmounting phase includes function called components will unmount.']}], 'duration': 624.512, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA1070666.jpg', 'highlights': ['Props in React.js are read-only and immutable, ensuring that they cannot be changed.', "The use of setState to update the state of React components Using this.setState function, the state of the component can be changed, for example, changing the name to 'Jueha' and ID to 2222.", 'Differences between stateful and stateless components Stateful components store information about component state change in memory and have authority to change the state, while stateless components calculate the internal state of the components and do not have authority to change the state.']}, {'end': 2109.679, 'segs': [{'end': 1722.219, 'src': 'embed', 'start': 1695.638, 'weight': 6, 'content': [{'end': 1700.36, 'text': 'So all these are the lifecycle methods which are used in React.js.', 'start': 1695.638, 'duration': 4.722}, {'end': 1703.33, 'text': 'Now, what is an event in React?', 'start': 1701.749, 'duration': 1.581}, {'end': 1711.994, 'text': 'Events are triggered reactions, or I will say actions to specific actions like mouse over, mouse click, key press, et cetera.', 'start': 1703.95, 'duration': 8.044}, {'end': 1715.176, 'text': 'React events are similar to HTML JavaScript events.', 'start': 1712.394, 'duration': 2.782}, {'end': 1720.118, 'text': 'So for example, in this example or in this diagram, as you can see, this is a bulb.', 'start': 1715.596, 'duration': 4.522}, {'end': 1722.219, 'text': 'There is an action called switch on.', 'start': 1720.679, 'duration': 1.54}], 'summary': 'React.js lifecycle methods and events mimic html javascript events, with examples like mouse over and mouse click.', 'duration': 26.581, 'max_score': 1695.638, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA1695638.jpg'}, {'end': 1812.837, 'src': 'embed', 'start': 1766.435, 'weight': 2, 'content': [{'end': 1773.919, 'text': "It combines the browser behavior into one API, and they're done to ensure events have consistent properties across different browsers.", 'start': 1766.435, 'duration': 7.484}, {'end': 1781.323, 'text': 'So if you want to have a React.js application running on different browsers, you will use synthetic events in React.js.', 'start': 1774.459, 'duration': 6.864}, {'end': 1785.865, 'text': 'But what do you understand by refs, which are references in React.js?', 'start': 1781.843, 'duration': 4.022}, {'end': 1794.417, 'text': 'So refs stands for references, So they are used to return references to a particular element or component returned by render.', 'start': 1786.285, 'duration': 8.132}, {'end': 1800.001, 'text': 'They are basically useful when we need DOM measurements or to add methods to the components.', 'start': 1794.797, 'duration': 5.204}, {'end': 1803.784, 'text': 'List some of the cases when you should use refs.', 'start': 1801.202, 'duration': 2.582}, {'end': 1810.068, 'text': 'So first of all, they are used to manage focus, text selection, or media playback.', 'start': 1804.564, 'duration': 5.504}, {'end': 1812.837, 'text': 'for triggering imperative animations.', 'start': 1810.796, 'duration': 2.041}], 'summary': 'Api combines browser behavior for consistent events. refs in react.js for managing focus, text selection, media playback, and imperative animations.', 'duration': 46.402, 'max_score': 1766.435, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA1766435.jpg'}, {'end': 1870.567, 'src': 'embed', 'start': 1838.527, 'weight': 5, 'content': [{'end': 1841.269, 'text': 'we can write the components separately in different files.', 'start': 1838.527, 'duration': 2.742}, {'end': 1847.294, 'text': 'So for one file, we will use the export property, and for another file, we can use the import property.', 'start': 1841.67, 'duration': 5.624}, {'end': 1850.076, 'text': 'That is how you can modularize the React.js code.', 'start': 1847.354, 'duration': 2.722}, {'end': 1857.142, 'text': "And as you can see on the screen, the two code snippets for, or two files, I'll say, for export and import properties.", 'start': 1850.557, 'duration': 6.585}, {'end': 1864.368, 'text': 'How forms are created in React? This is, again, a very basic interview question with respect to React.js.', 'start': 1858.143, 'duration': 6.225}, {'end': 1870.567, 'text': 'So HTML form elements maintain their own state in regular DOM and update themselves based on user input.', 'start': 1864.943, 'duration': 5.624}], 'summary': 'Modularizing react.js code with separate files using export and import properties. html form elements maintain their own state and update based on user input.', 'duration': 32.04, 'max_score': 1838.527, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA1838527.jpg'}, {'end': 1941.153, 'src': 'embed', 'start': 1899.514, 'weight': 1, 'content': [{'end': 1901.695, 'text': 'The state is not maintained in controlled components.', 'start': 1899.514, 'duration': 2.181}, {'end': 1905.916, 'text': 'Data is controlled by parent component, not by the child components.', 'start': 1902.255, 'duration': 3.661}, {'end': 1911.537, 'text': 'The control components takes in current value through props and notifies changes via callbacks.', 'start': 1906.536, 'duration': 5.001}, {'end': 1914.472, 'text': 'I talk about uncontrolled components.', 'start': 1912.691, 'duration': 1.781}, {'end': 1916.254, 'text': 'They maintain their own state.', 'start': 1914.993, 'duration': 1.261}, {'end': 1920.937, 'text': 'Data is controlled by DOM, and reps are used to get their current values.', 'start': 1916.754, 'duration': 4.183}, {'end': 1923.759, 'text': 'If you want to use REST, we need to have uncontrolled components.', 'start': 1920.997, 'duration': 2.762}, {'end': 1928.783, 'text': 'Now what are HOC? When I say HOC, these are high-order components.', 'start': 1924.88, 'duration': 3.903}, {'end': 1934.508, 'text': 'So these are the custom components, I will say, which we developed while doing programming in React.js.', 'start': 1929.604, 'duration': 4.904}, {'end': 1937.89, 'text': 'So these are the custom components which reps another component.', 'start': 1934.928, 'duration': 2.962}, {'end': 1941.153, 'text': 'They accept dynamically provided child components.', 'start': 1938.431, 'duration': 2.722}], 'summary': 'Controlled components use props and callbacks, while uncontrolled components maintain their own state and use the dom for data control. hocs are custom components that represent other components and accept dynamically provided child components.', 'duration': 41.639, 'max_score': 1899.514, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA1899514.jpg'}, {'end': 2030.578, 'src': 'embed', 'start': 2003.987, 'weight': 0, 'content': [{'end': 2011.128, 'text': 'I will say simplest component, or I can say the pure components which we can write in React.js and hence the performance,', 'start': 2003.987, 'duration': 7.141}, {'end': 2013.769, 'text': 'and I will say it is the fastest in React.js.', 'start': 2011.128, 'duration': 2.641}, {'end': 2018.05, 'text': 'What is the significance of keys in React.js?', 'start': 2014.649, 'duration': 3.401}, {'end': 2019.93, 'text': 'or what is the significance of keys in React??', 'start': 2018.05, 'duration': 1.88}, {'end': 2025.251, 'text': 'It is used to identify unique virtual DOM elements with their corresponding data driving the UI.', 'start': 2020.17, 'duration': 5.081}, {'end': 2030.578, 'text': 'So as we all know, there is a key value pair combination always in every programming language.', 'start': 2025.956, 'duration': 4.622}], 'summary': 'Keys in react.js are used to identify unique virtual dom elements and their data, driving the ui, contributing to faster performance.', 'duration': 26.591, 'max_score': 2003.987, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA2003987.jpg'}, {'end': 2119.564, 'src': 'embed', 'start': 2087.507, 'weight': 9, 'content': [{'end': 2089.909, 'text': "You see, we all know it's a model view controller.", 'start': 2087.507, 'duration': 2.402}, {'end': 2097.373, 'text': 'so what is the major problem? So DOM manipulation is very expensive because MVC framework is completely based on DOM and not on virtual DOM,', 'start': 2089.909, 'duration': 7.464}, {'end': 2098.614, 'text': 'just like in React.js.', 'start': 2097.373, 'duration': 1.241}, {'end': 2100.675, 'text': "It's slow and inefficient.", 'start': 2099.234, 'duration': 1.441}, {'end': 2104.236, 'text': 'And there is a lot of memory wastage in MVC framework.', 'start': 2101.115, 'duration': 3.121}, {'end': 2109.679, 'text': 'Because of circular dependency, complicated model was created around models and views.', 'start': 2104.857, 'duration': 4.822}, {'end': 2113.941, 'text': 'So these are some of the drawbacks or problems with MVC framework.', 'start': 2110.299, 'duration': 3.642}, {'end': 2119.564, 'text': 'Now Flux, before Redux there was a technology called Flux which was introduced by Facebook.', 'start': 2114.5, 'duration': 5.064}], 'summary': 'Mvc framework is slow and inefficient due to dom manipulation, causing memory wastage and circular dependency. flux was introduced as an alternative by facebook.', 'duration': 32.057, 'max_score': 2087.507, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA2087507.jpg'}], 'start': 1695.638, 'title': 'React.js lifecycle and interview insights', 'summary': 'Covers react.js lifecycle methods, events, synthetic events, refs, modularization, interview insights, form creation, controlled and uncontrolled components, hocs, pure components, significance of keys, and problems with mvc framework. it emphasizes the importance of rendering optimization and performance improvement using keys in react.js and discusses the inefficiencies of dom manipulation in mvc framework.', 'chapters': [{'end': 1857.142, 'start': 1695.638, 'title': 'React.js lifecycle, events, synthetic events, refs, and modularization', 'summary': 'Discusses react.js lifecycle methods, events, synthetic events, refs, and modularization, where it explains how to create events, use synthetic events, understand refs, and modularize code in react.js.', 'duration': 161.504, 'highlights': ['Events in React.js Events in React.js are triggered reactions to specific actions like mouse over, mouse click, key press, etc., similar to HTML JavaScript events.', "Synthetic events in React.js Synthetic events are cross-browser wrappers around the browser's native event system, ensuring consistent properties across different browsers for React.js applications.", 'Refs in React.js Refs in React.js are used to return references to a particular element or component returned by render, useful for managing focus, text selection, media playback, imperative animations, and integrating with third party DOM libraries.', 'Modularization of code in React.js Code can be modularized in React.js by using the export and import standard or properties, allowing components to be written separately in different files.']}, {'end': 2109.679, 'start': 1858.143, 'title': 'React.js interview insights', 'summary': 'Discusses react.js interview insights including the creation of forms, controlled and uncontrolled components, hocs, pure components, significance of keys, and problems with mvc framework, highlighting the optimization of rendering and performance improvement using keys in react.js and the inefficiencies of dom manipulation in mvc framework.', 'duration': 251.536, 'highlights': ['The significance of keys in React.js lies in identifying unique virtual DOM elements, optimizing rendering by recycling existing DOM elements, and reordering elements without re-rendering, ultimately leading to performance optimization and increased application performance in React.js.', 'Controlled components in React.js do not maintain their own state and are controlled by the parent component, taking in current value through props and notifying changes via callbacks.', 'Uncontrolled components maintain their own state, with data controlled by the DOM and current values obtained using refs, suitable for using REST.', 'HOCs (High-Order Components) in React.js are custom components that wrap another component and are developed to add functionality, allowing code reuse, logic and bootstrap abstraction, state and props manipulations, and render hijacking.', 'Pure components in React.js are the simplest and fastest components, replacing any component that only has render and contributing to the simplicity and performance of the application.', 'The major problems with MVC framework lie in the expensive DOM manipulation, slowness, inefficiency, and memory wastage due to circular dependency and complicated model creation around models and views.']}], 'duration': 414.041, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA1695638.jpg', 'highlights': ['The significance of keys in React.js lies in identifying unique virtual DOM elements, optimizing rendering by recycling existing DOM elements, and reordering elements without re-rendering, ultimately leading to performance optimization and increased application performance in React.js.', 'HOCs (High-Order Components) in React.js are custom components that wrap another component and are developed to add functionality, allowing code reuse, logic and bootstrap abstraction, state and props manipulations, and render hijacking.', "Synthetic events in React.js are cross-browser wrappers around the browser's native event system, ensuring consistent properties across different browsers for React.js applications.", 'Controlled components in React.js do not maintain their own state and are controlled by the parent component, taking in current value through props and notifying changes via callbacks.', 'Uncontrolled components maintain their own state, with data controlled by the DOM and current values obtained using refs, suitable for using REST.', 'Modularization of code in React.js by using the export and import standard or properties, allowing components to be written separately in different files.', 'Events in React.js are triggered reactions to specific actions like mouse over, mouse click, key press, etc., similar to HTML JavaScript events.', 'Refs in React.js are used to return references to a particular element or component returned by render, useful for managing focus, text selection, media playback, imperative animations, and integrating with third party DOM libraries.', 'Pure components in React.js are the simplest and fastest components, replacing any component that only has render and contributing to the simplicity and performance of the application.', 'The major problems with MVC framework lie in the expensive DOM manipulation, slowness, inefficiency, and memory wastage due to circular dependency and complicated model creation around models and views.']}, {'end': 2386.246, 'segs': [{'end': 2138.618, 'src': 'embed', 'start': 2110.299, 'weight': 1, 'content': [{'end': 2113.941, 'text': 'So these are some of the drawbacks or problems with MVC framework.', 'start': 2110.299, 'duration': 3.642}, {'end': 2119.564, 'text': 'Now Flux, before Redux there was a technology called Flux which was introduced by Facebook.', 'start': 2114.5, 'duration': 5.064}, {'end': 2124.988, 'text': 'So what was Flux? Architectural pattern that enforces unidirectional data flow.', 'start': 2120.344, 'duration': 4.644}, {'end': 2130.352, 'text': 'So there on the screen as you can see there is an action, then dispatcher, store and view.', 'start': 2125.368, 'duration': 4.984}, {'end': 2134.314, 'text': 'So architectural pattern that enforces unidirectional data flow.', 'start': 2130.932, 'duration': 3.382}, {'end': 2138.618, 'text': 'Controls derived data and enables communication between multiple components.', 'start': 2134.635, 'duration': 3.983}], 'summary': 'Drawbacks of mvc, flux enforces unidirectional data flow for derived data and component communication.', 'duration': 28.319, 'max_score': 2110.299, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA2110299.jpg'}, {'end': 2191.515, 'src': 'embed', 'start': 2158.109, 'weight': 0, 'content': [{'end': 2163.294, 'text': 'What is Redux? Redux is one of the hottest library I will say for front end development.', 'start': 2158.109, 'duration': 5.185}, {'end': 2164.616, 'text': 'It is very, very famous.', 'start': 2163.374, 'duration': 1.242}, {'end': 2170.201, 'text': 'You can also check how much it is famous and its popularity on GitHub sites that it has more number of stars.', 'start': 2164.976, 'duration': 5.225}, {'end': 2173.443, 'text': 'and more number of watches as compared to flux.', 'start': 2171.161, 'duration': 2.282}, {'end': 2176.665, 'text': "It's a predictable state container for JavaScript apps.", 'start': 2173.963, 'duration': 2.702}, {'end': 2181.668, 'text': 'It is mostly used for state management applications where the state needs to be managed.', 'start': 2177.125, 'duration': 4.543}, {'end': 2191.515, 'text': 'Applications developed with Redux are easy to test and it helps to write applications that behave consistently and can run in different environments.', 'start': 2182.529, 'duration': 8.986}], 'summary': 'Redux is a popular state management library with high popularity on github, known for predictable state container for javascript apps.', 'duration': 33.406, 'max_score': 2158.109, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA2158109.jpg'}, {'end': 2242.431, 'src': 'embed', 'start': 2219.202, 'weight': 4, 'content': [{'end': 2227.204, 'text': "What do you understand by single source of truth? When I say single source of truth, it is the store which I'm talking about in Redux application.", 'start': 2219.202, 'duration': 8.002}, {'end': 2231.784, 'text': 'Redux uses store for storing all the application state at one place.', 'start': 2227.602, 'duration': 4.182}, {'end': 2237.708, 'text': 'Whatever the state happening or state changes happening in a React Redux application,', 'start': 2232.585, 'duration': 5.123}, {'end': 2242.431, 'text': 'it will be notified to store or it will happen in conjunction with the store.', 'start': 2237.708, 'duration': 4.723}], 'summary': 'Redux uses a single source of truth, the store, to store all application state in one place.', 'duration': 23.229, 'max_score': 2219.202, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA2219202.jpg'}, {'end': 2291.341, 'src': 'embed', 'start': 2266.373, 'weight': 2, 'content': [{'end': 2273.678, 'text': "because it's a single state tree, makes it easier to keep track of the changes over time and debug or inspect the application.", 'start': 2266.373, 'duration': 7.305}, {'end': 2276.34, 'text': 'What are the various components of Redux?', 'start': 2274.539, 'duration': 1.801}, {'end': 2281.914, 'text': 'first one is the action, which is an object that describe what happened.', 'start': 2277.25, 'duration': 4.664}, {'end': 2291.341, 'text': 'reducer, it is a place to determine how the state will change, but I will say the reducers are the pure functions, which is how it needs to be done.', 'start': 2281.914, 'duration': 9.427}], 'summary': 'Redux uses a single state tree, with actions and pure functions as reducers.', 'duration': 24.968, 'max_score': 2266.373, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA2266373.jpg'}], 'start': 2110.299, 'title': 'Transitioning from mvc to flux and redux', 'summary': 'Discusses the limitations of mvc, introduces flux as an architectural pattern enforcing unidirectional data flow, and highlights redux as a popular state container. it emphasizes single source of truth, pure functions, single state tree, actions, reducers, stores, and views in redux.', 'chapters': [{'end': 2242.431, 'start': 2110.299, 'title': 'Drawbacks of mvc and advantages of flux and redux', 'summary': 'Discusses the problems with mvc framework, introduces flux as an architectural pattern that enforces unidirectional data flow, and highlights redux as a popular and predictable state container for javascript apps, emphasizing its principles of single source of truth and pure functions.', 'duration': 132.132, 'highlights': ['Redux is a predictable state container for JavaScript apps, known for its popularity and ease of testing. Redux is highlighted as a popular and predictable state container, emphasizing its ease of testing and popularity on GitHub.', 'Flux is an architectural pattern that enforces unidirectional data flow and provides stability to applications by controlling derived data. Flux is emphasized as an architectural pattern that enforces unidirectional data flow and provides stability to applications by controlling derived data.', 'Store in Flux is the central authority for all data, ensuring that any update in data must occur within the store only. The importance of the store in Flux is highlighted, emphasizing its role as the central authority for all data and the requirement for updates to occur within the store only.', 'Redux follows the principles of single source of truth and changes made with pure functions, ensuring a consistent application state. The principles of Redux, including single source of truth and changes made with pure functions, are emphasized for ensuring a consistent application state.', 'MVC framework drawbacks are mentioned, indicating the need for alternatives such as Flux and Redux. The drawbacks of the MVC framework are mentioned, indicating the need for alternatives such as Flux and Redux.']}, {'end': 2386.246, 'start': 2242.911, 'title': 'Understanding redux in application development', 'summary': 'Discusses the single state tree in redux, the components of redux including action, reducer, store, and view, and the flow of data through redux, emphasizing the importance of type property in actions and the use of pure functions in reducers.', 'duration': 143.335, 'highlights': ['The single state tree in Redux makes it easier to keep track of changes and debug the application, providing a centralized location for the state of all components.', 'The components of Redux include actions, which describe what happened, and reducers, which are pure functions that determine how the state will change.', 'The store in Redux serves as the single source of truth for state management, storing the state object tree of the entire application.', 'The flow of data through Redux involves container components passing data as props to actions, which then pass the data to reducers, and eventually to the view part of the application.', 'In Redux, actions are defined with a type property that indicates the type of action to be performed, usually defined as a string constant, allowing the addition of multiple properties.']}], 'duration': 275.947, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA2110299.jpg', 'highlights': ['Redux is a predictable state container for JavaScript apps, known for its popularity and ease of testing.', 'Flux is an architectural pattern that enforces unidirectional data flow and provides stability to applications by controlling derived data.', 'The single state tree in Redux makes it easier to keep track of changes and debug the application, providing a centralized location for the state of all components.', 'The components of Redux include actions, which describe what happened, and reducers, which are pure functions that determine how the state will change.', 'The store in Redux serves as the single source of truth for state management, storing the state object tree of the entire application.']}, {'end': 2728.231, 'segs': [{'end': 2418.073, 'src': 'embed', 'start': 2386.726, 'weight': 1, 'content': [{'end': 2391.689, 'text': 'But the most mandatory part or the most important part for an action is it needs to have a type property.', 'start': 2386.726, 'duration': 4.963}, {'end': 2395.432, 'text': 'And actions are created using functions called action creators.', 'start': 2392.21, 'duration': 3.222}, {'end': 2399.995, 'text': 'The other question which we have is what is the role of reducers?', 'start': 2396.352, 'duration': 3.643}, {'end': 2406.788, 'text': 'Reducers are the pure functions which specify how the application state changes in response to an action.', 'start': 2400.785, 'duration': 6.003}, {'end': 2411.73, 'text': 'It takes in the previous state and an action and returns the new state.', 'start': 2407.548, 'duration': 4.182}, {'end': 2418.073, 'text': 'So what is the work of a reducer basically? It takes the previous state, make the changes and it returns the new state.', 'start': 2412.09, 'duration': 5.983}], 'summary': 'Actions must have a type property; reducers change app state in response to actions.', 'duration': 31.347, 'max_score': 2386.726, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA2386726.jpg'}, {'end': 2477.13, 'src': 'embed', 'start': 2450.365, 'weight': 0, 'content': [{'end': 2455.85, 'text': 'It maintains the application or I can say it maintains the state tree of the particular application.', 'start': 2450.365, 'duration': 5.485}, {'end': 2456.651, 'text': 'That is the store.', 'start': 2455.93, 'duration': 0.721}, {'end': 2462.443, 'text': 'provides helper methods to access the state, dispatch action, and register listeners.', 'start': 2457.52, 'duration': 4.923}, {'end': 2469.006, 'text': 'With store, the data state can be synchronized from the server level to the client layer without much hassle.', 'start': 2463.103, 'duration': 5.903}, {'end': 2473.348, 'text': "And since it's a single store, it's a single source of truth.", 'start': 2469.926, 'duration': 3.422}, {'end': 2477.13, 'text': "it's a single place to maintain the state tree of the application.", 'start': 2473.348, 'duration': 3.782}], 'summary': 'Store maintains state tree, synchronizes data, single source of truth.', 'duration': 26.765, 'max_score': 2450.365, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA2450365.jpg'}, {'end': 2583.708, 'src': 'embed', 'start': 2551.204, 'weight': 2, 'content': [{'end': 2553.325, 'text': 'The testing and debugging part will be easy.', 'start': 2551.204, 'duration': 2.121}, {'end': 2564.493, 'text': 'and huge open source community for Redux is available out there on internet and precise organization of code because there is only one store which is maintaining the state.', 'start': 2554.285, 'duration': 10.208}, {'end': 2565.774, 'text': 'complete state of the application.', 'start': 2564.493, 'duration': 1.281}, {'end': 2572.239, 'text': 'So these are some of the advantages of Redux which makes React Redux application very famous and very popular.', 'start': 2566.174, 'duration': 6.065}, {'end': 2578.924, 'text': 'Now moving to the last part or the last section of this webinar that is the React Router interview questions.', 'start': 2573.12, 'duration': 5.804}, {'end': 2583.708, 'text': "What is React Router? Very powerful routing library I'll say.", 'start': 2579.985, 'duration': 3.723}], 'summary': 'Redux offers easy testing, large open source community, and precise code organization with only one store maintaining the state, making react redux application popular. react router is a powerful routing library.', 'duration': 32.504, 'max_score': 2551.204, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA2551204.jpg'}, {'end': 2624.866, 'src': 'embed', 'start': 2596.513, 'weight': 4, 'content': [{'end': 2599.894, 'text': 'Why switch keyword is used in React Router version four?', 'start': 2596.513, 'duration': 3.381}, {'end': 2606.896, 'text': 'The switch keyword is used when you want to display only a single route to be rendered among several defined routes.', 'start': 2600.434, 'duration': 6.462}, {'end': 2614.699, 'text': 'So as you can see here, if I want to have multiple defined routes, but I want to display only a single route, then I use the switch statement.', 'start': 2607.594, 'duration': 7.105}, {'end': 2624.866, 'text': 'Why do we need a router in React? So router helps in defining multiple routes inside the router with each route leading to a unique view.', 'start': 2615.8, 'duration': 9.066}], 'summary': 'React router v4 uses switch to display single route among multiple defined routes. router helps define multiple routes leading to unique views.', 'duration': 28.353, 'max_score': 2596.513, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA2596513.jpg'}, {'end': 2668.022, 'src': 'embed', 'start': 2636.991, 'weight': 3, 'content': [{'end': 2639.032, 'text': 'Let us down the advantages of React Router.', 'start': 2636.991, 'duration': 2.041}, {'end': 2641.914, 'text': 'So there are various advantages of React Router.', 'start': 2639.653, 'duration': 2.261}, {'end': 2642.995, 'text': 'The API is very simple.', 'start': 2641.934, 'duration': 1.061}, {'end': 2645.276, 'text': 'And the API is all about component.', 'start': 2643.575, 'duration': 1.701}, {'end': 2648.998, 'text': 'The API is component based, the router APIs.', 'start': 2645.316, 'duration': 3.682}, {'end': 2651.74, 'text': 'It can be visualized as a single root component.', 'start': 2649.499, 'duration': 2.241}, {'end': 2654.522, 'text': 'No need to manually set history value.', 'start': 2652.461, 'duration': 2.061}, {'end': 2658.044, 'text': 'It has separate packages for web and native platforms.', 'start': 2654.982, 'duration': 3.062}, {'end': 2659.205, 'text': 'Very famous.', 'start': 2658.645, 'duration': 0.56}, {'end': 2668.022, 'text': 'How React Router is different from conventional routing of data? So, again, there is a table of the differences based on the various topics.', 'start': 2660.455, 'duration': 7.567}], 'summary': 'React router offers simple api, component-based routing, and separate packages for web and native platforms.', 'duration': 31.031, 'max_score': 2636.991, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA2636991.jpg'}, {'end': 2707.679, 'src': 'embed', 'start': 2680.233, 'weight': 5, 'content': [{'end': 2687.039, 'text': 'If I talk about the URL changes, in conventional routing, HTTP request is sent to the server and corresponding HTML page is received.', 'start': 2680.233, 'duration': 6.806}, {'end': 2690.474, 'text': 'In React Router, only the history attribute is changed.', 'start': 2687.813, 'duration': 2.661}, {'end': 2695.375, 'text': 'This is a very drastic change in the request response terminologies.', 'start': 2690.934, 'duration': 4.441}, {'end': 2701.337, 'text': 'If I talk about the look and feel, user actually navigates across different pages for each view in conventional routing.', 'start': 2695.395, 'duration': 5.942}, {'end': 2707.679, 'text': "But for React Router, user is still thinking he's navigating across different pages, but it is actually not the case.", 'start': 2701.797, 'duration': 5.882}], 'summary': 'React router drastically changes request response terminologies, user perception of navigation.', 'duration': 27.446, 'max_score': 2680.233, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA2680233.jpg'}], 'start': 2386.726, 'title': 'Redux in react and react router', 'summary': 'Covers the basics and advantages of redux in react, highlighting action creators, reducers, store significance, and differences from flux, emphasizing predictability, maintainability, and fast application. it also includes react router interview q&a, emphasizing its powerful routing library, simplicity, and component-based api, with separate packages for web and native platforms.', 'chapters': [{'end': 2572.239, 'start': 2386.726, 'title': 'Redux in react: basics and advantages', 'summary': 'Explains the role of action creators, reducers, the significance of the store, and the differences between redux and flux, emphasizing the advantages of redux, including predictability, maintainability, and fast application with a precise organization of code.', 'duration': 185.513, 'highlights': ['Reducers specify how the application state changes in response to an action, taking in the previous state and an action and returning the new state. Reducers are pure functions that determine what sort of update needs to be done based on the type of action and return the new values, maintaining the application state.', 'Store in Redux is the single source of truth, maintaining the state tree of the application, and provides helper methods to access the state, dispatch action, and register listeners. The store in Redux holds the application state and ensures synchronization from the server level to the client layer, making development of large applications easy and fast.', 'Redux has advantages such as predictability, maintainability, fast application, ease of testing and debugging, and a huge open source community, making it popular for React Redux applications. The advantages of Redux include predictability, maintainability, fast application, ease of testing and debugging, and a large open source community, making it popular for React Redux applications.']}, {'end': 2728.231, 'start': 2573.12, 'title': 'React router interview q&a', 'summary': 'Covers react router interview questions, highlighting its powerful routing library, advantages, and differences from conventional routing, emphasizing its simplicity and component-based api, with a separate package for web and native platforms.', 'duration': 155.111, 'highlights': ['React Router is a very powerful routing library, helping in adding new screens and flows to the application, and keeping the URL in sync with the displayed data on the webpage.', 'The advantages of React Router include its simple API, component-based nature, single root component visualization, and separate packages for web and native platforms.', 'The switch keyword in React Router version four is used to display only a single route among several defined routes, simplifying the rendering process.', 'The need for a router in React lies in defining multiple routes, with each route leading to a unique view, as represented by multiple React routers on the screen.', 'In React Router, only a single HTML page is involved, unlike conventional routing where each view corresponds to a new file, leading to a significant difference in URL changes and user navigation.']}], 'duration': 341.505, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/39ZiaKb1bSA/pics/39ZiaKb1bSA2386726.jpg', 'highlights': ['Redux store maintains the state tree, providing helper methods for state access and action dispatch.', 'Reducers in Redux are pure functions that determine state updates based on action types.', 'Redux offers predictability, maintainability, fast application, and a large open source community.', 'React Router is a powerful routing library with a simple API and separate packages for web and native platforms.', 'Switch keyword in React Router v4 simplifies the rendering process by displaying a single route.', 'React Router uses a single HTML page, unlike conventional routing, leading to significant URL changes and user navigation differences.']}], 'highlights': ["React.js is a front-end JavaScript library developed by Facebook in 2013 and has become very popular in the developer's community, with Facebook deploying it in its news feed in 2011, resulting in significant UI improvements for the application.", 'There is an increase in React job vacancies in both India and the USA.', 'The newsfeed and comment sections of Facebook are being developed in React.js.', 'Facebook and Instagram are the main applications maintaining React, with React following a component-based approach and being open source, making it a widely used and influential library in the market.', 'The increased reach of React.js among developers from 2014 to 2017 is discussed.', 'The popularity of React.js on platforms like GitHub and other websites is mentioned.', 'Vipul Jain, with seven years of experience in SharePoint, .NET, Office 365, jQuery, JavaScript, AngularJS, and ReactJS, provides insights into React interview questions and its relevance in the current market.', 'An upcoming webinar covering general React questions, React components, React Redux, and React router interview questions is introduced.', 'The number of job postings for React professionals on various portals in India was observed as of September 2017.', 'ReactJS is a front-end JavaScript library developed by Facebook in 2011, following a component-based approach.', 'It allows the creation of reusable UI components.', 'It was open-sourced in 2015, and has a strong foundation and large community base.', 'Main Features of React React uses virtual DOM, server-side rendering, and follows unidirectional data flow, ensuring optimized application performance and one-way data binding.', 'Advantages of React React increases application performance, is easy to integrate with other libraries like AngularJS and Meteor, improves readability, and simplifies writing UI test cases.', 'Virtual DOM Working Virtual DOM re-renders the entire UI with underlying data changes, calculates the differences with the previous DOM representation, and updates the real DOM with only the changes.', "Browsers can't read JSX and need JSX transformers like Babel for conversion to JavaScript objects before rendering.", 'The process of transforming JSX files involves using JSX transformers like Babel, which convert JSX files to JavaScript objects before they can be rendered.', 'The shift from ES5 to ES6 involves changing the syntax from using react.createClass to using the class keyword which extends react.component.', 'React focuses on view part, using virtual DOM, one-way data binding.', 'Angular uses real DOM, two-way data binding, runtime debugging.', 'Compile time debugging for ReactJS.', 'ReactJS is introduced by Facebook, whereas AngularJS is from Google.', 'Props in React.js are read-only and immutable, ensuring that they cannot be changed.', "The use of setState to update the state of React components Using this.setState function, the state of the component can be changed, for example, changing the name to 'Jueha' and ID to 2222.", 'Differences between stateful and stateless components Stateful components store information about component state change in memory and have authority to change the state, while stateless components calculate the internal state of the components and do not have authority to change the state.', 'The significance of keys in React.js lies in identifying unique virtual DOM elements, optimizing rendering by recycling existing DOM elements, and reordering elements without re-rendering, ultimately leading to performance optimization and increased application performance in React.js.', 'HOCs (High-Order Components) in React.js are custom components that wrap another component and are developed to add functionality, allowing code reuse, logic and bootstrap abstraction, state and props manipulations, and render hijacking.', "Synthetic events in React.js are cross-browser wrappers around the browser's native event system, ensuring consistent properties across different browsers for React.js applications.", 'Controlled components in React.js do not maintain their own state and are controlled by the parent component, taking in current value through props and notifying changes via callbacks.', 'Uncontrolled components maintain their own state, with data controlled by the DOM and current values obtained using refs, suitable for using REST.', 'Modularization of code in React.js by using the export and import standard or properties, allowing components to be written separately in different files.', 'Events in React.js are triggered reactions to specific actions like mouse over, mouse click, key press, etc., similar to HTML JavaScript events.', 'Refs in React.js are used to return references to a particular element or component returned by render, useful for managing focus, text selection, media playback, imperative animations, and integrating with third party DOM libraries.', 'Pure components in React.js are the simplest and fastest components, replacing any component that only has render and contributing to the simplicity and performance of the application.', 'The major problems with MVC framework lie in the expensive DOM manipulation, slowness, inefficiency, and memory wastage due to circular dependency and complicated model creation around models and views.', 'Redux is a predictable state container for JavaScript apps, known for its popularity and ease of testing.', 'Flux is an architectural pattern that enforces unidirectional data flow and provides stability to applications by controlling derived data.', 'The single state tree in Redux makes it easier to keep track of changes and debug the application, providing a centralized location for the state of all components.', 'The components of Redux include actions, which describe what happened, and reducers, which are pure functions that determine how the state will change.', 'The store in Redux serves as the single source of truth for state management, storing the state object tree of the entire application.', 'Redux store maintains the state tree, providing helper methods for state access and action dispatch.', 'Reducers in Redux are pure functions that determine state updates based on action types.', 'Redux offers predictability, maintainability, fast application, and a large open source community.', 'React Router is a powerful routing library with a simple API and separate packages for web and native platforms.', 'Switch keyword in React Router v4 simplifies the rendering process by displaying a single route.', 'React Router uses a single HTML page, unlike conventional routing, leading to significant URL changes and user navigation differences.']}