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How to Learn React in 2020

One of the biggest challenges that all front-end developers face is building responsive and complex UI, while retaining high load time and enhancing performances. The User Interface is what grabs the attention of the users and increases the popularity of your website. A website that is slow and takes a lot of time to get loaded will be abandoned more often than not. In this respect React is a bestselling tool for developers, as it ensures better user experience and optimizes app performances.  Though it sounds very cool, learning a new technology can be a daunting prospect. A planned approach can be extremely helpful while learning new skills. Before we start, let us look at what we will learn in this blog! Introduction to React React VS Other frameworks React prerequisites Approach to mastering a skill Online learning process Roadmaps to learn React Fundamentals Why should I learn React? Challenges while learning ConclusionIntroduction to React: React is a powerful JavaScript Library, created by Facebook. It is open source and a component-based UI library tool. All the elements which we see in a website built on React are composed of several sub-components e.g., the buttons, side menus, navigation bar, headers, footers, paragraphs etc. To know about more about the components and other features you should check out this official documentation at https://reactjs.org/ React VS other Frameworks/Libraries The frameworks for Web development are: Angular Angular is an application design framework (not a JS Library) which is based on TypeScript and is open source. It is maintained and managed by the Angular Team at Google and can be used to create efficient Single Page Applications (SPAs) for enterprises. Pros: Easily create Single Page Applications Prototyping, Development, and testing becomes faster It supports 2-way data binding DOM Manipulation is easy and hence server-side load is minimized Responsive web designing Latest Angular versions support TypeScript which makes it easier to learn Good community support Cons: Challenging to understand MVC for beginners Some features are difficult to understand e.g., dependency injection, services etc. Poor response during Search Engine Optimization Official Documentation Link:  https://angular.io/docs Vuejs It is a JavaScript-based UI framework. It is used for building user interfaces and creating Single Page Applications with the help of some libraries. Pros: Remarkably simple to use It has good documentation It supports virtual DOM Manipulation and 2-way Data binding Unit testing can be efficiently done Good community support Cons: It is not suitable for large-scale projects Limited resources Not immensely popular among developers Official Documentation Link:  https://vuejs.org/v2/guide/ There are several other JS libraries and frameworks in the market. Click the links below to know more about these libraries or frameworks. jQuery Official Documentation Link:  https://jquery.com/ Emberjs Official Documentation Link:  https://emberjs.com/ Backbonejs Official Documentation Link:  https://backbonejs.org/ Semantic-UI Official Documentation Link:  https://semantic-ui.com/ Foundation Official Documentation Link:  https://get.foundation/ Svelte Official Documentation Link:  https://svelte.dev/ Here’s what makes React more powerful than others: It is based on Components, and the same components can be reused We can break the whole UI into smallest components It is simple to use One-way data binding It uses virtual DOM, that means there is lesser load in the server-side rendering High performance Good documentation Downsides of React JSX is very confusing in the beginning Version conflicts and new documentation Subsequent latest updates and versions have caused chaos and confusion Here is a quick analysis of how the popularity of React has increased in recent years: Image SourceReact Prerequisites: Before diving into the learning path, you should have the following prerequisites Familiarity with any programming language Basic string, array manipulation operations OOPs concepts Basics of HTML, CSS, and JavaScript Deep interest to learn new skills Approach to master a skill:  These are the things you must consider while mastering a skill: Know your abilities, self-evaluate Track your learning process Create timelines Revise and focus on weak areas Take help from experts Practically apply whatever you have learnt so far Learn, do not cram Practice, practice and again, practice! Create projects Share your learning outcomes on LinkedIn, push your codes on GitHub repositories Compete online Online learning process: Learning new skills online saves a lot of time. We can learn at our own convenience and manage our schedules comfortably. While learning online: Choose a course based on values and outcomes It should include projects and technical support while learning A course that offers a mini-certification or a minor degree is more valuable Create a dedicated time-duration for your online classes Stick with the time and practice daily Focus on the main concepts and clear your doubts at the same time Maintain notes and revise them Ask good questions and get your doubts cleared. Here are a few courses you might wish to explore: Free: https://www.codecademy.com/learn/react-101 https://egghead.io/courses/start-learning-react https://egghead.io/courses/the-beginner-s-guide-to-react https://scrimba.com/learn/learnreact https://ui.dev/free-react-bootcamp/ Paid: https://egghead.io/browse/frameworks/react https://frontendmasters.com/courses/ https://courses.reacttraining.com/p/advanced-react https://www.newline.co/fullstack-react/ https://reactforbeginners.com/ You can find other useful resources here: https://reactjs.org/community/courses.html Roadmaps to learn React 1. Learn the basics of HTML: HTML stands for Hypertext Markup Language, and is a standard markup language to create web pages. We use different tags to structure the parts of a web page. Different HTML elements tell the browser how the content should be displayed on the browser. You must be aware of the following things: Basics of all tags, new features, and support in HTML5 How to link external CSS file Various attributes Embedding Audio, Images and Videos (Media) CSS: CSS stands for Cascading Style Sheets. It is used to format the web pages and primarily focuses on the look and feel of the web pages. We can control the styles of the HTML elements with CSS. We can also change the position, layout, arrangements of the HTML elements using CSS. We can add CSS to a HTML document in three ways – Inline, Internal and External.  Be sure to check-out the following points:  How to link external CSS files Attribute selectors Box-model JavaScript: It adds interactivity and dynamics in the HTML document. It is a client-side scripting language. To take inputs from users, validate them, display alerts etc., we use JavaScript.  Following are the important points to consider: Functions Strings Array manipulation Loops Printing alerts Logging on consoles2. Tools and Software GitHub: It is a hosting service which allows users to store and manage their source codes. It provides a helpful graphical UI (User Interface) to manage your projects. We can also access this using the command line. Once you start the actual coding and working on projects, you must use GitHub to manage your source codes. It also provides team collaboration. Focus on the following important points and learn: How to create a repository Pushing your code on GitHub Creating branches Git commands Team collaboration Version control Code Editors VS Code: It is a powerful source code editor used by most of the developers. It provides additional extensions and development tools which prove to be extremely helpful while writing the code.  3. Package Managers Npm or Yarn These are tools used to manage the packages and libraries. You can choose the package manager of your choice. Learn command line commands to create a project,  to install, remove - new modules, packages to update the versions 4. Advanced Concepts in Development ES6: It stands for ECMAScript 6, with ES6 being the 6th version of ECMAScript. ECMAScript was introduced to standardize JavaScript and was published in 2015. Due to new releases, there are some functionality changes in the previous concepts of React. State managements: It is a special technique which React uses to manipulate, update the values and data associated with the components. Passing values among components: Usually we pass the data from parent to child using props. There are alternative ways to pass the data using Redux and Context API. These are some advanced concepts which are particularly important. Component State/Context API Redux  Async and Await API Requests Promises Observable Helpers Data persistence 5. Better Styling using third party packages and plugins Learn how to add Bootstrap in your applications make your webpage responsive as per the various screen sizes apply Material Designs in your components, set default colors for your projects - Color palettes: primary, secondary, tertiary colors  6. Working with API Fetching data from APIs Get and Post requests Handling promises and observables 7. Routing and Navigation Loading other components in the same page Navigation among various components and views 8. Testing Testing is an important part in a Software Development Life Cycle. Testing ensures the quality of the development work. We use the following resources to test the React components. Jest: Jest is a JavaScript test runner that lets you access the DOM through jsdom.  React Testing Library: it is a lightweight solution to test the React components.  Find the official documentation here: https://reactjs.org/docs/testing.html Fundamentals Styling standards Create reusable and standard components and apply proper styling in components. Coding Standards Write reusable and quality code – writing a superior quality code enhances the performance of the whole application. Apply proper naming conventions while writing the code. Why should I learn React? Good community support Distinguished career ahead Regular updates and new versions Immense popularity Good income High demands in market Choice of new developers According to https://www.glassdoor.co.in/ average salary of the React developer is: Challenges while learning As is the case when you are learning something new, you may find some challenges or difficulty in the learning process. You can take help from several communities, e.g., stackoverflow, quora etc. to clear your doubts. Focus on learning the following topics: Hooks and Redux Promises Data binding Functional and class-based components Lifecycle of components Conclusion Technologies are changing at warp speed, and new innovations in the existing structures and workflow are implemented on a regular basis. To adapt to these changes, it's important to keep your skills and competencies updated as well. As some concepts and their implementations may be older,  always follow the official documentation, upskill yourself and stay relevant in the workforce!   

How to Learn React in 2020

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How to Learn React in 2020

One of the biggest challenges that all front-end developers face is building responsive and complex UI, while retaining high load time and enhancing performancesThe User Interface is what grabs the attention of the users and increases the popularity of your websiteA website that is slow and takes a lot of time to get loaded will be abandoned more often than notIn this respect React is a bestselling tool for developers, as it ensures better user experience and optimizes app performances.  

Though it sounds very cool, learning a new technology can be a daunting prospectA planned approach can be extremely helpful while learning new skills. 

Before we start, let us look at what we will learn in this blog! 

  1. Introduction to React 
  2. React VS Other frameworks 
  3. React prerequisites 
  4. Approach to mastering a skill 
  5. Online learning process 
  6. Roadmaps to learn React 
  7. Fundamentals 
  8. Why should I learn React? 
  9. Challenges while learning 
  10. Conclusion

Introduction to React: 

React is a powerful JavaScript Library, created by Facebook. It is open source and component-based UI library tool. 

How to Learn React in 2020

All the elements which we see in a website built on React are composed of several sub-components e.g., the buttons, side menus, navigation bar, headers, footers, paragraphs etc. 

To know about more about the components and other features you should check out this official documentation at https://reactjs.org/ 

React VS other Frameworks/Libraries 

The frameworks for Web development are: 

  • Angular 

Angular is an application design framework (not a JS Library) which is based on TypeScript and is open sourceIt is maintained and managed by the Angular Team at Google and can be used to create efficient Single Page Applications (SPAs) for enterprises. 

AngularPros: 

  1. Easily create Single Page Applications 
  2. Prototyping, Development, and testing becomes faster 
  3. It supports 2-way data binding 
  4. DOM Manipulation is easy and hence server-side load is minimized 
  5. Responsive web designing 
  6. Latest Angular versions support TypeScript which makes it easier to learn 
  7. Good community support 

Cons: 

  1. Challenging to understand MVC for beginners 
  2. Some features are difficult to understand e.g., dependency injection, services etc. 
  3. Poor response during Search Engine Optimization 

Official Documentation Link:  https://angular.io/docs 

  • Vuejs 

It is JavaScript-based UI framework. It is used for building user interfaces and creating Single Page Applications with the help of some libraries. 

VuejsPros: 

  1. Remarkably simple to use 
  2. It has good documentation 
  3. It supports virtual DOM Manipulation and 2-way Data binding 
  4. Unit testing can be efficiently done 
  5. Good community support 

Cons: 

  1. It is not suitable for large-scale projects 
  2. Limited resources 
  3. Not immensely popular among developers 

Official Documentation Link:  https://vuejs.org/v2/guide/ 

There are several other JS libraries and frameworks in the marketClick the links below to know more about these libraries or frameworks. 

How to Learn React in 2020

  • jQuery 

Official Documentation Link:  https://jquery.com/ 

  • Emberjs 

Official Documentation Link:  https://emberjs.com/ 

  • Backbonejs 

Official Documentation Link:  https://backbonejs.org/ 

  • Semantic-UI 

Official Documentation Link:  https://semantic-ui.com/ 

  • Foundation 

Official Documentation Link:  https://get.foundation/ 

  • Svelte 

Official Documentation Link:  https://svelte.dev/ 

Here’s what makes React more powerful than others: 

  1. It is based on Componentsand the same components can be reused 
  2. We can break the whole UI into smallest components 
  3. It is simple to use 
  4. One-way data binding 
  5. It uses virtual DOM, that means there is lesser load in the server-side rendering 
  6. High performance 
  7. Good documentation 

Downsides of React 

  1. JSX is very confusing in the beginning 
  2. Version conflicts and new documentation 
  3. Subsequent latest updates and versions have caused chaos and confusion 

Here is a quick analysis of how the popularity of React has increased in recent years: 

How to Learn React in 2020Image Source

React Prerequisites: 

Before diving into the learning path, you should have the following prerequisites 

  1. Familiarity with any programming language 
  2. Basic string, array manipulation operations 
  3. OOPs concepts 
  4. Basics of HTML, CSS, and JavaScript 
  5. Deep interest to learn new skills 

Approach to master a skill: 

 These are the things you must consider while mastering a skill: 

  1. Know your abilities, self-evaluate 
  2. Track your learning process 
  3. Create timelines 
  4. Revise and focus on weak areas 
  5. Take help from experts 
  6. Practically apply whatever you have learnt so far 
  7. Learn, do not cram 
  8. Practice, practice and again, practice! 
  9. Create projects 
  10. Share your learning outcomes on LinkedIn, push your codes on GitHub repositories 
  11. Compete online 

Online learning process: 

Learning new skills online saves lot of time. We can learn at our own convenience and manage our schedules comfortablyWhile learning online: 

  1. Choose a course based on values and outcomes 
  2. It should include projects and technical support while learning 
  3. A course that offers mini-certification or a minor degree is more valuable 
  4. Create a dedicated time-duration for your online classes 
  5. Stick with the time and practice daily 
  6. Focus on the main concepts and clear your doubts at the same time 
  7. Maintain notes and revise them 
  8. Ask good questions and get your doubts cleared. 

Here are a few courses you might wish to explore: 

Free: 

  1. https://www.codecademy.com/learn/react-101 
  2. https://egghead.io/courses/start-learning-react 
  3. https://egghead.io/courses/the-beginner-s-guide-to-react 
  4. https://scrimba.com/learn/learnreact 
  5. https://ui.dev/free-react-bootcamp/ 

Paid: 

  1. https://egghead.io/browse/frameworks/react 
  2. https://frontendmasters.com/courses/ 
  3. https://courses.reacttraining.com/p/advanced-react 
  4. https://www.newline.co/fullstack-react/ 
  5. https://reactforbeginners.com/ 

You can find other useful resources here: https://reactjs.org/community/courses.html 

Roadmaps to learn React 

1. Learn the basics of 

How to Learn React in 2020

  • HTMLHTML stands for Hypertext Markup Language, and is a standard markup language to create web pages. We use different tags to structure the parts of a web page. Different HTML elements tell the browser how the content should be displayed on the browser. 

You must be aware of the following things: 

  1. Basics of all tags, new features, and support in HTML5 
  2. How to link external CSS file 
  3. Various attributes 
  4. Embedding Audio, Images and Videos (Media) 
  • CSS: CSS stands for Cascading Style Sheets. It is used to format the web pages and primarily focuses on the look and feel of the web pages. We can control the styles of the HTML elements with CSS. We can also change the position, layout, arrangements of the HTML elements using CSS. 

We can add CSS to a HTML document in three ways – Inline, Internal and External.  

Be sure to check-out the following points:  

  1. How to link external CSS files 
  2. Attribute selectors 
  3. Box-model 
  • JavaScript: It adds interactivity and dynamics in the HTML document. It is client-side scripting language. To take inputs from users, validate them, display alerts etc., we use JavaScript.  

Following are the important points to consider: 

  1. Functions 
  2. Strings 
  3. Array manipulation 
  4. Loops 
  5. Printing alerts 
  6. Logging on consoles

2. Tools and Software 

  • GitHub: It is hosting service which allows users to store and manage their source codes. It provides a helpful graphical UI (User Interface) to manage your projects. We can also access this using the command line. Once you start the actual coding and working on projects, you must use GitHub to manage your source codes. It also provides team collaboration. 

Github

Focus on the following important points and learn: 

  1. How to create a repository 
  2. Pushing your code on GitHub 
  3. Creating branches 
  4. Git commands 
  5. Team collaboration 
  6. Version control 
  • Code Editors 

Visual Studio Code

VS CodeIt is a powerful source code editor used by most of the developers. It provides additional extensions and development tools which prove to be extremely helpful while writing the code.  

3. Package Managers 

Npm or Yarn 

These are tools used to manage the packages and libraries. You can choose the package manager of your choice. 

Learn command line commands to 

  1. create project 
  2. to install, remove - new modules, packages 
  3. to update the versions 

4. Advanced Concepts in Development 

ES6: It stands for ECMAScript 6, with ES6 being the 6th version of ECMAScript. ECMAScript was introduced to standardize JavaScript and was published in 2015. Due to new releases, there are some functionality changes in the previous concepts of React. 

  • State managements: It is a special technique which React uses to manipulate, update the values and data associated with the components. 
  • Passing values among components: Usually we pass the data from parent to child using props. There are alternative ways to pass the data using Redux and Context API. 

These are some advanced concepts which are particularly important. 

  • Component State/Context API 
  • Redux  
  • Async and Await 
  • API Requests 
  • Promises 
  • Observable 
  • Helpers 
  • Data persistence 

5. Better Styling using third party packages and plugins 

Learn how to 

  1. add Bootstrap in your applications 
  2. make your webpage responsive as per the various screen sizes 
  3. apply Material Designs in your components, 
  4. set default colors for your projects - Color palettes: primary, secondary, tertiary colors 

Bootstrap

 

6. Working with API 

  • Fetching data from APIs 
  • Get and Post requests 
  • Handling promises and observables 

How to Learn React in 2020

7. Routing and Navigation 

  • Loading other components in the same page 
  • Navigation among various components and views 

8. Testing 

Testing is an important part in a Software Development Life Cycle. Testing ensures the quality of the development work. We use the following resources to test the React components. 

  • Jest: Jest is a JavaScript test runner that lets you access the DOM through jsdom 
  • React Testing Library: it is a lightweight solution to test the React components.  

Find the official documentation here: https://reactjs.org/docs/testing.html 

Fundamentals 

  • Styling standards 

Create reusable and standard components and apply proper styling in components. 

  • Coding Standards 

  1. Write reusable and quality code – writing a superior quality code enhances the performance of the whole application. 

  1. Apply proper naming conventions while writing the code. 

Why should I learn React? 

  • Good community support 
  • Distinguished career ahead 
  • Regular updates and new versions 
  • Immense popularity 
  • Good income 
  • High demands in market 
  • Choice of new developers 

According to https://www.glassdoor.co.in/ average salary of the React developer is

How to Learn React in 2020

How to Learn React in 2020

Challenges while learning 

As is the case when you are learning something new, you may find some challenges or difficulty in the learning process. You can take help from several communities, e.g., stackoverflowquora etc. to clear your doubts. Focus on learning the following topics: 

  • Hooks and Redux 
  • Promises 
  • Data binding 
  • Functional and class-based components 
  • Lifecycle of components 

Conclusion 

Technologies are changing at warp speed, and new innovations in the existing structures and workflow are implemented on a regular basis. To adapt to these changesit's important to keep your skills and competencies updated as well. As some concepts and their implementations may be older,  always follow the official documentation, upskill yourself and stay relevant in the workforce  

KnowledgeHut

KnowledgeHut

Author

KnowledgeHut is an outcome-focused global ed-tech company. We help organizations and professionals unlock excellence through skills development. We offer training solutions under the people and process, data science, full-stack development, cybersecurity, future technologies and digital transformation verticals.
Website : https://www.knowledgehut.com

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If users are not able to engage with HTMLs, browsers will end up becoming boring pieces of software, they figured.That’s when Brendan Eich came into the picture. He was contracted in 1995 by Netscape Communications to develop a language which would have a low learning curve, so that anyone would be able to write functionalities with it. He developed the language in just 10 days and named it Mocha. A working prototype of Mocha was integrated in the Netscape Browser in May 1995, renaming the language to LiveScript and later in December 1995, it was renamed again, this time as JavaScript. The marketing team at Netscape chose to call it "JavaScript" as Java was extremely popular at that time. With the popularity of Netscape Navigator, Microsoft wished to capture the browser market and developed Internet Explorer with a scripting language named JScript. For a long time, there was no common standard formed for JavaScript, resulting in huge cross browser compatibility issues. Finally, in 1997, Netscape invited ECMA (European Computer Manufacturing Association) to take the responsibility of forming a specification for JavaScript.Since then, the ECMA has released updated specifications for JavaScript regularly and browsers try to follow these specifications in their implementation of JavaScript engine.Fact Check: Today, Brendan Eich is the CEO of Brave Software which builds a privacy oriented, chromium-based browser named Brave.Fact Check: Netscape Navigator later became the foundation stone for Mozilla Firefox. They retained the same name for their JavaScript engine "Spider Monkey" which was part of the Netscape navigator.Need of Framework With the ECMAScript specifications in place, developers began to use JavaScript  to make the HTML page much more dynamic using JavaScript. However, there were still a few developers who preferred to write big client-side functionality with JavaScript, owing to low performance of browser and JavaScript engines. Perhaps, the industry had a more a server-side performance focus in that era. Then, as computers became more powerful, browser performance improved and JavaScript engines evolved, developers started moving client-side logic to browser using JavaScript.Once developers started writing more and more JavaScript, the community felt the need to write logic in a more structured and scalable manner, so as to be more understandable, readable, manageable and less error prone. The need for a framework in JavaScript was clearly felt.Many frameworks like Dojo, Backbone, Ember and AngularJS eventually emerged within their own communities, which tried to solve problems in their unique way. Collectively, this has helped the whole JS community to move forward towards a more scalable and maintainable web application. ReactJS In 2011, Codebase for Facebook Ads was getting bigger. Developers began to face maintenance issues with it and it was getting harder to add new features in an efficient way. That's when Facebook engineer, Jordan Walke, built a prototype for an efficient application UI. This marked the birth of ReactJS, initially called FaxJS. Later, when Instagram was acquired by Facebook, the folks at Instagram wanted to adopt this framework. Pete Hunt and Jordan Walke then improved, decoupled the library and made it open source as ReactJS in 2013. Since then ReactJS has gone through many changes. The latest version of ReactJS in 2020 is currently 16.13. ReactJS follows component-based architecture and encourages developers to think in terms of small, composable components. Interestingly, this methodology is aligned with an efficient approach for solving any problem in life: the first step to solve a big problem is to break it down into multiple smaller sub problems. Once you have a solution for each sub-problem, you can then add it up to get the overall solution. This can be applied to all problems, big or small. ReactJS asks developer to adopt a problem-solving approach like this to build any UI. It must be noted that ReactJS does not aim to solve each and every problem of building a web application. Rather, it has a narrow focus and a limited scope to solve the one core problem of web development around how to efficiently updating the UI/views.When ReactJS was open sourced in the JSConf 2013, the ideas and changes that ReactJS was proposing were not very well received. For instance, although two-way binding was very popular, ReactJS went ahead with one way data flow. In another example, writing HTML inside JS was considered a bad practice, but ReactJS still wanted to use JSX. All these ideas initially attracted a lot of criticism from the web developer community. In time, however, developers started using it and found it easy to build components efficiently. So, ReactJS now solved the one problem around updating views. But what about all the problems in web development? An ecosystem began to emerge to address the other problems along with ReactJS. Libraries like Redux and React-Router came to life, making ReactJS a complete web framework, although this meant that there would be a dependency on multiple libraries. The ease of using ReactJS trumped all the negative points of the framework and this is what continues to make it a very popular library in web development. In 2020, ReactJS has 50K plus stars on Github and is downloaded 6 million times per week. The ReactJS ecosystem continues to grow steadily; React Native recently bought ReactJS to build cross mobile platform apps. Libraries like Gatsby and NextJS encourage developers to use ReactJS on server and provide benefits of server-side rendering without much hassle. ReactJS has also stood out in multiple developer surveys such as the State of JavaScript. Main design concepts in ReactJS Main design concepts in ReactJSDeclarative, composable, reusable componentsReactJS motivates developers to write small components and reuse the same component at multiple places. Re-usability of components greatly speeds up the overall development and results in less amount of code. Less code is always better because it is less prone to errors. ReactJS encourages developers to write composable components which can be wrapped around any other React component to provide special functionality, thus discouraging the writing of components that do too many things. ReactJS always encourages developers to break their problem into smaller problems, solve the smaller problems first and then combine them to present the overall solution. Less functionality in components always leads to less error prone components. ReactJS encourages developers to write clean, readable, and maintainable code. This is why it emphasizes writing declarative components, which make a codebase easier to read and understand by fellow developers.Declarative, composable components looks a lot like HTML in JS. Instead of standard HTML tags, we have React components as tags. This similarity to standard web semantics is what makes JS somewhat familiar to developers starting out. Reactive Updates Writing static HTML is no fun and it can be said that JavaScript was born to bring interactivity to web pages. ReactJS helps developer to add functionalities in components with which the user can interact and see the results. ReactJS allows developers to attach a state to component and whenever the state of components changes, the component efficiently re-renders itself to produce an updated view. Now, the state of the component can be changed by clicking a button, entering text into the input box or any other part of the component triggering an event. The React component listens to these events and acts accordingly. Updating the whole component UI seems like a terrible idea, but ReactJS has implemented this terrible idea wonderfully by doing it efficiently. In-memory DOM representation ReactJS is able to efficiently update views by keeping a DOM representation in memory known as virtual DOM. Upcoming updates always compare the new DOM with an older copy of the DOM and based on the difference, it figures out the actual DOM elements which need to be updated on the UI. Reducing the number of DOM manipulations makes ReactJS faster. What this means is that writing smaller React components will take up less memory to store DOM representations (Virtual DOM) and ultimately, this results in better performance. Features of ReactJS Main features of ReactJSJSX and Why is it needed When ReactJS was released, it was mentioned in documentation that it is recommended to use JSX along with ReactJS. Now, what is JSX? and do i really need another library to use the ReactJS library? So, let us see how a simple ReactJS component looks without JSX: import React from "react";  function Greeting({ name }) {    return React.createElement("h1", null, `Hello ${name}`);  }  ReactDOM.render(  React.createElement("Greeting", { name: "Gully Boy" }, null),  document.getElementById("root")  ); There is no way the above code looks like a declarative component. The truth is JavaScript does not understand HTML or XML like tags. That is why we need someone to do that conversion for us. Here enters JSX, also known as a syntax extension for JavaScript. With JSX, the above Greeting React component will look something like this: import React from "react";  function Greeting({ name }) {    return {`Hello ${name}`};  }  ReactDOM.render(, document.getElementById("root")); JSX actually makes ReactJS code more readable and understandable. You can assume this as a templating library which converts HTML looking syntax into ReactJS element JS code by calling createElement(). Virtual DOM ReactJS has made the term, 'VDOM' or virtual DOM very popular in the JavaScript community. Web browsers have provided APIs to interact with DOM to make our web page dynamic. One can dynamically add or remove nodes in the web page by using these APIs. But interacting with these APIs was very slow, as changing node triggers re-layout and re-paint event for sub-tree. Although the entire subtree is re-rendered (diffing stops when an element type has been modified and subtree is freshly rendered), even in case of virtual DOM reconciliation, the advantage that React offers is that the developer is freed from figuring out which part of DOM really requires updates - the diffing and reconciliation algorithm takes care of it.  React has thus provided a way to reduce the number to change in DOM using virtual DOM. The VDOM is a JavaScript object which contains information of DOM sub tree. We can also call this an object representation of DOM. React uses this object to compare subsequent modification and figure out the minimum number of modifications needed to make in browser DOM to get the desired result. ReactJS claims that the wonderful performance of their library is because of the algorithm they use to compare the virtual DOM. React Native React native is another popular library which is used to build cross platform mobile applications using JavaScript. Before ReactJS, Cordova and ionic were some frameworks which were very popular to build mobile applications using JavaScript. However, these applications did not perform very well. React native uses popular component-based concepts of ReactJS and provides a way to build an efficient mobile application. React native converts JS code into native platform code to run in mobile devices. This approach has improved the performance of mobile applications by a great deal in comparison to other frameworks like ionic. With React Native, ReactJS has now become a very popular library to build UI on any platform. ReactJS: Here to stay Over the past decade, the JavaScript community has seen tremendous changes in language within the developer community. It has seen a lot of new ideas and terms surface in the form of libraries. Developers are building and sharing their work with rest of the world quite frequently and every other day, implementations are open sourced on Github. These new ideas and the problem solving approach continues to help the JavaScript ecosystem to evolve and become better. Prior to ReactJS, JQuery was very popular and was the default library for any web project involving DOM manipulation. With AngularJS and other MVC libraries, we were encouraged to think about a problem in terms of Modal, View and Controller. People have always sought to figure out an approach that can solve the problem. And structuring a solution in a scalable manner is not a new challenge either. We have already implemented scalable solutions at server-side, and they are performing quite well. ReactJS now brings the same pattern to the front-end, where the final output is a UI. To implement this, we break the problem into smaller sub-problems and write solutions for them. This is the basic mental model to solve all UI problems and ReactJS focuses on the same. New ideas in the JavaScript community help the community move forward and eventually, the best solutions become part of the standard JS (ECMAScript). ES modules, promises and some lodash utilities are examples of this. When a library moves in the same general direction as the web, it is bound to be used by a large community. Developers will use these solutions until new specifications are finalized and browsers adopting new specifications. Interim, people will use the feature in the form of third party library.So, is ReactJS moving in the right direction? I would say yes. ReactJS is evolving right along the evolving standards of JavaScript. The front-end community is leaning more towards concepts of functional programming rather than object-oriented methodology. In a similar direction, ReactJS continues to move towards a functional programming pattern. ReactJS has introduced hooks in version 16.8, which encourages developer to build more and more functional components instead of class-based components. Hook does not even work with class-based component. Understanding well that it sometimes becomes a hectic task to figure out which library one should choose to handle state management, ContextAPI and useReducer hooks have been introduced, which help in managing state in small applications much better. Today, with the help of ContextAPI and useReducer hooks, you can build an application without using any other library like Redux. This, however, does not mean that you should stop using Redux as it has its own benefits.Component based architecture is also aligned with the standard web components support in browsers, which allow developers to write non-standard HTML tags in code. In short, ReactJS has made the community become familiar with some of the upcoming web standards. For this reason, I feel that conceptually, ReactJS is going to stay with the community for long. Many big companies like Facebook, Microsoft and AirBnB are supporting the direction and concepts of ReactJS, thus adding credibility to the library. With many big brains backing the library, the ReactJS community looks poised for growth. With no perfect solution to all the problems in web development in sight, the best option is to move forward with whatever is available at the moment. In the JavaScript community too, there is an effort to figure out an alternate to ReactJS such as VueJS and Svelte. Perhaps, ReactJS will get replaced by some other library in the future. However, the basic idea of creating smaller, reusable components is here to stay.Whatever framework we learn, it is most important to grasp the basic idea behind the library. It is this idea or design pattern that is going to remain for good. It may appear in front of you in a different form and shape, but the idea will remain forever. 
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Why ReactJS is taking over Frontend Development

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Exploring the Various Decorators in Angular

There are several important concepts in Angular, and Decorators are an important concept to learn when you are working with version 2 and above of Angular. Through this post we will learn about decorators, its types and how it is being used in real time applications.  Decorators are an important concept in TypeScript and since Angular uses Typescript widely, decorators become an important part of Angular as well.  What are Decorators? Decorators are functions that are invoked with a prefixed @ symbol, and are immediately followed by a class, method or property. They allow a service, directive or filter to be changed before being used. Basically, a decorator provides configuration metadata that determines how the component, class or a function should be processed, instantiated and used at runtime. Angular defines a number of decorators that attach specific kinds of metadata to classes, so that the system knows what those classes mean and how they should work. There are various types of in-built decorators. Let’s look at each type of decorator in detail. Types of Decorators: There are four types of decorators and each type further has its own subset of decorators.  Class Decorators  This is the first type of decorator which tells us about a particular class’s intent and helps answer questions like whether the class is a component or a module. There are various Class decorators in Angular, and among them @Component and @NgModule are widely used. Let’s see the structure of class decorators via a code snippet. Explanation: The below code snippet uses @Component, which is a type of class decorator provided by Angular.Property Decorators Property decorators are used to decorate specific properties inside a class. Using a property decorator, we can easily identify why we use any particular property of a class Like @Input (), @Output, @ReadOnly (), @Override () The above code uses @Override decorator before the property name which will invoke the decorator. This is nothing but a function and will override the string property name from “pat” to “test”. Method Decorator  Method decorators, as the name indicates, are used to decorate the method defined inside our class with functionality. A common example of method decorator is @HostListener In the above screen shot @HostListener decorator is used before onHostClick () method. Parameter Decorators Parameter decorators allow us to decorate parameters in our class constructors.  @Inject () is a common and widely used parameter decorator. Using this decorator, we can inject services in Angular classes. Structure of Decorators  In all the code snippets that we have seen so far on decorators, you must have noticed that each of the decorators follows a similar pattern or structure when used in code. Each decorator starts with @ symbol and is added before the class, method, property or passed as a parameter. All are functions having open and close brackets. This helps us understand that it is the function which is used as an in-built decorator. Just like a function can be customized, decorators can also be customized. Based on the requirement in our project, we can create custom decorators and use them accordingly. Custom Decorator  In this section we are going to learn the steps involved in creating custom decorators. As the term custom itself suggests, it is something which we create based on our project need which is not already fulfilled by the in-built Angular decorator. So, whenever we want to add some more features to our class, property of class, or method of class we use custom decorators. Here we are going to create a custom class decorator. Step 1. In an Angular project solution structure, create a classes folder inside the app folder.  Inside the classes folder create a class named sample Demo . Step 2. Once the class is created, you can go ahead and create a folder inside the app folder called decorator and add a file name as class.decorator.ts  Step 3. As we know decorators are functions, so we will create a function named Logging, as follows: ‘target’ is the class on which this decorator is going to be used and as we are going to use this decorator on class sample Demo, we have added export keyword before this function. Step 4. As we are going to use this decorator in the sample demo, let us add the sample demo class with decorator.  If we add this class in our main component and invoke, we will see the output on console as custom decorator SampleDemo How to pass data to a decorator The example explained above is a simple custom decorator where we are logging some messages on the console along with the class name where it is used. But if we want to send messages through the class where we are adding the decorator, then we have to change the implementation of the Function Logging.  Function Logging will accept some arguments and return the message as passed by the decorator on class. When we use the decorators in Angular, we pass in some form of configuration, specific to the decorator. For example, when we use @Component we pass through an object, and with @HostListener we pass through a string as the first argument (the event name, such as 'click') and optionally an array of strings for further variables (such as $event) to be passed through to the decorated method. Uses of Decorators in Real Time Applications Almost all Angular applications use decorator concepts; as decorators are functions that allow a service, directive or filter to be modified prior to its usage. @override, @deprecate, @autobind, @mixin are decorators which are widely used in real time applications. Angular framework has several of these kinds of examples which help to achieve complex features in applications. We know now what Angular decorators are and how they work on class, property, methods and parameters to provide information about metadata. All decorators work on a similar principle. We can apply some changes to the behaviour of the default functionality or we can add some custom tweaks to the code before the decorator can be applied to a class, property or method.  There are different ways to call decorators as these decorators can control start from the class implementation to the property and method implementation within the class. Decorators are great when code needs to be customized to suit the needs of the clients and when in-built functions do not help us with what we need.  Summary  When it comes to Angular decorators, we have several options to inject our codes and logic on different levels of class; as everything in programming revolves around class and its objects. Angular, being a rich framework gives us wide options to handle things in our own way. TypeScript has introduced this concept of decorators and those wishing to implement decorators into their code will benefit from going through TypeScript documents to understand more about actual implementation of decorators and its advanced concepts.