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Reactjs vs React Native – Key Difference, Advantages, and Disadvantages

Web development is a very important concept in the 21st century. Every business, product developer, support provider, or marketer needs a website or a web application to interact with customers and share their brand, product, or service with the world. With such a high significance, it is important that you know the top formations of the day and how they compare to each other. JavaScript has been an important part of web development since its inception. React and React Native are among the top JavaScript frameworks that have taken the world by storm and created several trends, jobs, and aesthetically pleasing websites! It is essential that you understand the comparison between ReactJS vs React Native.Difference Between ReactJS and React NativeComparison FactorReact.jsReact NativePlatformReact is a framework for building applications using JavaScriptReact Native is a complete platform that allows building native and cross-platform mobile appsLearning CurveReact.js is the most used JavaScript library for creating high-performance UIs, which makes it easy to learnReact Native contains all the components of React; So, learning one is useful for bothRenderingBrowser code in React is rendered through the Virtual DOMReact Native uses native APIs to render all components on mobileSyntaxReact makes use of HTML and its syntax flowReact Native uses the React Native syntaxSupport for CSSReact works well with CSS for styling and animationsReact Native uses the Animated API to animate the components of the appWhat is ReactJS?ReactJS is a JavaScript library that combines the speed of JavaScript and a new way of rendering web pages, making them highly dynamic and responsive to user input. As a result, this product significantly changed the development approach of Facebook. After the library was released as an open-source JavaScript tool in 2013, it became prevalent due to its revolutionary approach to UI programming, leading to a long-standing relationship between React and Angular, another popular web development tool.What is React Native?Two years after releasing ReactJS as an open-source tool, Facebook engineers introduced React Native, a hybrid app development framework for iOS and Android. The tool was based on the same principles as ReactJS and was soon accepted by the engineering community and companies adhering to the mobile-first strategy.React Native is a cross-platform mobile framework that uses ReactJs to build unique websites and applications. It helps your developers to build mobile apps by compiling native app components into JavaScript, having the ability to run on various platforms like Android, Windows, iOS.The more exciting part is that React Native builds the Reactjs framework under its own framework and Reactjs helps build components with React Native.Introduction to React NativeMany people use React Native, from beginners who have just started their career in programming to advanced iOS developers. React Native is a framework developed by Facebook for creating native-style apps for iOS and Android under a common language, JavaScript. Facebook only introduced React Native to support its iOS system for the first time. However, with its recent (January 20, 2021) support for the Android operating system, the library can now offer mobile UIs for both platforms.Features of React NativePlatform-Specific Code: One of the significant benefits of using React Native is to get in the habit of writing platform-specific code for developing custom business applications and websites. As a framework, React Native automatically builds the application by detecting the platform it runs on. This helps your business build the correct code for the right platform, thereby improving your development process.Accelerated Application Development: Most of the code available in React Native is JavaScript which helps front-end developers to build applications faster. With such a web development framework, developers only have to learn about the platform API, platform-centric design, some native user interface elements, and JavaScript. Even if you are not a great developer, you can quickly get started with React Native and turn your business idea into tangible reality.Hot Reloading Feature: With React Native, your development team will gain the ability to reload a mobile application seamlessly. This gives your business enough freedom to lift the loading time and user experience.Intuitive UI Experience: The React Native Framework consists of component UI libraries that businesses can use to provide a seamless UI experience to their users. Sharing UI libraries like Expo, Shout On, etc., saves a lot of time to build them from the beginning. Using React Native lets you focus entirely on innovation. Instead of curating libraries from scratch, you can focus on building your business.Components of ReactReact allows you to reuse code components at different levels, saving time. The designers constantly reuse the same assets. If they didn't, they would have to make a company logo, for instance, over and over again. It's clear: reusing components is a design efficiency. In programming, this process is a bit more complicated. System upgrades often become a headache, as each change can affect the performance of other system components.It is easier for developers to manage updates because all ReactJS components are isolated, and changes made in one do not affect the others. This makes it possible to reuse components that do not change to make programming more accurate, ergonomic, and comfortable for developers.Data workflow in ReactJSReactJS allows working with other components directly and uses data backlinking to ensure that child structures do not affect their parents. This makes the code stable.The most complex view model systems of JS representations have an important but understandable flaw - the data flow structure. For example, in a view model system, child elements can affect the parent if they are changed. Facebook removed these issues in React JS, making it only visible.Instead of using explicit data binding, ReactJS uses the data flow in one direction-down, meaning a structure of child elements cannot affect the parent elements. Thus, only a developer needs to change its state and apply updates to modify an object. Accordingly, only authorized components will be upgraded.Usage of React NativeApplications developed on React Native work well with Android and iOS systems. React Native provides cross-platform accessibility, and that is the best part. Let's look at some more reasons why people like to use React Native:1. Live ReloadingOne interesting feature of React Native is the availability of live reloading. Any changes you make to the application's code will be replaced during the development process. Any changes in logic are recorded on the screen, and you can see these changes almost immediately.2. Strong performance capabilityReact Native strongly caters to the needs of developers working on mobile applications. It provides a framework for improved performance using a Graphics Processing Unit (GPU).3. Budget-friendly and saves costLike React JS, React Native can also reuse code components. Reuse would mean that it would save a lot of time and money needed to develop an application from scratch.4. Community DrivenReact Native was developed through a developer's community hackathon. This means that the framework is constantly developed and supported by the community. The presence of a team helps to structure expertise from diverse minds.Expo and React NativeExpo is a universal React app building platform that helps you rapidly develop, build, deploy and iterate mobile apps. It provides a range of tools that make developing with React Native simpler. Although you don’t require Expo to build React Native apps, it helps developers remove the need for basic native knowledge.Expo Go is an app that you can download to your phone to "see" your app in development.Expo CLI is a tool to build, manage and develop your apps.The Expo SDK is a set of modular packages that access native APIs such as Camera and Notifications.Expo Snack refers to a web-based playground. You can write and run React Native snippets in the browser.You will sometimes see a mention of Expo in the React Native documentation. It's the easiest way to start building your app, and there's no lock-in. Once you get started with Expo, you can always eject back into React Native.How does this work?Two important threads run in every React Native application. One of them is the main thread, which runs in every standard native app. It displays the elements of the user interface and processes user gestures.The second one is specific to React Native. Its function is to execute JavaScript code in a separate JavaScript engine. JavaScript is used to deal with the business logic of the app. It also defines the structure and functionality of the user interface. These two threads never communicate directly and block each other.Advantages of using React NativeTo avoid separate development, the logic layer can be reused to build the same app for both Android and iOS.React Native renders some code components with native APIs.If you know how to work with JavaScript, then you can easily work with React Native.To repair old applications, you only need to add React Native UI components, and there is no need to rewrite them.React Native adds React to applications, allowing easy use across various tools.It helps in creating an effective user experience without much effort.React Native VS React.js: ApplicationsFamous applications using React and React.jsStatisticsReact Native for a Mobile-First WorldThe main reasons to consider using React Native technology is the low app development cost and the potential for rapid application development. React Native works well if you are looking to build a single mobile application for two platforms such as iOS, Android where speed of operation is not important.Since React Native enables rapid application development, it is also a good tool for prototyping and rapidly delivering the idea to market for business validation.Another advantage of this framework is that it allows us to quickly provide new functionality on supported platforms.React Native uses the popular JavaScript language and ReactJS framework, which means that the number of experienced software developers available in the market is huge.
Reactjs vs React Native – Key Difference, Advantages, and Disadvantages
Rajesh
Rajesh

Rajesh Bhagia

Blog Author

Rajesh Bhagia is experienced campaigner in Lamp technologies and has 10 years of experience in Project Management. He has worked in Multinational companies and has handled small to very complex projects single-handedly. He started his career as Junior Programmer and has evolved in different positions including Project Manager of Projects in E-commerce Portals. Currently, he is handling one of the largest project in E-commerce Domain in MNC company which deals in nearly 9.5 million SKU's.

In his role as Project Manager at MNC company, Rajesh fosters an environment of teamwork and ensures that strategy is clearly defined while overseeing performance and maintaining morale. His strong communication and client service skills enhance his process-driven management philosophy.

Rajesh is a certified Zend Professional and has developed a flair for implementing PMP Knowledge Areas in daily work schedules. He has well understood the importance of these process and considers that using the knowledge Areas efficiently and correctly can turn projects to success. He also writes articles/blogs on Technology and Management

Posts by Rajesh Bhagia

Reactjs vs React Native – Key Difference, Advantages, and Disadvantages

Web development is a very important concept in the 21st century. Every business, product developer, support provider, or marketer needs a website or a web application to interact with customers and share their brand, product, or service with the world. With such a high significance, it is important that you know the top formations of the day and how they compare to each other. JavaScript has been an important part of web development since its inception. React and React Native are among the top JavaScript frameworks that have taken the world by storm and created several trends, jobs, and aesthetically pleasing websites! It is essential that you understand the comparison between ReactJS vs React Native.Difference Between ReactJS and React NativeComparison FactorReact.jsReact NativePlatformReact is a framework for building applications using JavaScriptReact Native is a complete platform that allows building native and cross-platform mobile appsLearning CurveReact.js is the most used JavaScript library for creating high-performance UIs, which makes it easy to learnReact Native contains all the components of React; So, learning one is useful for bothRenderingBrowser code in React is rendered through the Virtual DOMReact Native uses native APIs to render all components on mobileSyntaxReact makes use of HTML and its syntax flowReact Native uses the React Native syntaxSupport for CSSReact works well with CSS for styling and animationsReact Native uses the Animated API to animate the components of the appWhat is ReactJS?ReactJS is a JavaScript library that combines the speed of JavaScript and a new way of rendering web pages, making them highly dynamic and responsive to user input. As a result, this product significantly changed the development approach of Facebook. After the library was released as an open-source JavaScript tool in 2013, it became prevalent due to its revolutionary approach to UI programming, leading to a long-standing relationship between React and Angular, another popular web development tool.What is React Native?Two years after releasing ReactJS as an open-source tool, Facebook engineers introduced React Native, a hybrid app development framework for iOS and Android. The tool was based on the same principles as ReactJS and was soon accepted by the engineering community and companies adhering to the mobile-first strategy.React Native is a cross-platform mobile framework that uses ReactJs to build unique websites and applications. It helps your developers to build mobile apps by compiling native app components into JavaScript, having the ability to run on various platforms like Android, Windows, iOS.The more exciting part is that React Native builds the Reactjs framework under its own framework and Reactjs helps build components with React Native.Introduction to React NativeMany people use React Native, from beginners who have just started their career in programming to advanced iOS developers. React Native is a framework developed by Facebook for creating native-style apps for iOS and Android under a common language, JavaScript. Facebook only introduced React Native to support its iOS system for the first time. However, with its recent (January 20, 2021) support for the Android operating system, the library can now offer mobile UIs for both platforms.Features of React NativePlatform-Specific Code: One of the significant benefits of using React Native is to get in the habit of writing platform-specific code for developing custom business applications and websites. As a framework, React Native automatically builds the application by detecting the platform it runs on. This helps your business build the correct code for the right platform, thereby improving your development process.Accelerated Application Development: Most of the code available in React Native is JavaScript which helps front-end developers to build applications faster. With such a web development framework, developers only have to learn about the platform API, platform-centric design, some native user interface elements, and JavaScript. Even if you are not a great developer, you can quickly get started with React Native and turn your business idea into tangible reality.Hot Reloading Feature: With React Native, your development team will gain the ability to reload a mobile application seamlessly. This gives your business enough freedom to lift the loading time and user experience.Intuitive UI Experience: The React Native Framework consists of component UI libraries that businesses can use to provide a seamless UI experience to their users. Sharing UI libraries like Expo, Shout On, etc., saves a lot of time to build them from the beginning. Using React Native lets you focus entirely on innovation. Instead of curating libraries from scratch, you can focus on building your business.Components of ReactReact allows you to reuse code components at different levels, saving time. The designers constantly reuse the same assets. If they didn't, they would have to make a company logo, for instance, over and over again. It's clear: reusing components is a design efficiency. In programming, this process is a bit more complicated. System upgrades often become a headache, as each change can affect the performance of other system components.It is easier for developers to manage updates because all ReactJS components are isolated, and changes made in one do not affect the others. This makes it possible to reuse components that do not change to make programming more accurate, ergonomic, and comfortable for developers.Data workflow in ReactJSReactJS allows working with other components directly and uses data backlinking to ensure that child structures do not affect their parents. This makes the code stable.The most complex view model systems of JS representations have an important but understandable flaw - the data flow structure. For example, in a view model system, child elements can affect the parent if they are changed. Facebook removed these issues in React JS, making it only visible.Instead of using explicit data binding, ReactJS uses the data flow in one direction-down, meaning a structure of child elements cannot affect the parent elements. Thus, only a developer needs to change its state and apply updates to modify an object. Accordingly, only authorized components will be upgraded.Usage of React NativeApplications developed on React Native work well with Android and iOS systems. React Native provides cross-platform accessibility, and that is the best part. Let's look at some more reasons why people like to use React Native:1. Live ReloadingOne interesting feature of React Native is the availability of live reloading. Any changes you make to the application's code will be replaced during the development process. Any changes in logic are recorded on the screen, and you can see these changes almost immediately.2. Strong performance capabilityReact Native strongly caters to the needs of developers working on mobile applications. It provides a framework for improved performance using a Graphics Processing Unit (GPU).3. Budget-friendly and saves costLike React JS, React Native can also reuse code components. Reuse would mean that it would save a lot of time and money needed to develop an application from scratch.4. Community DrivenReact Native was developed through a developer's community hackathon. This means that the framework is constantly developed and supported by the community. The presence of a team helps to structure expertise from diverse minds.Expo and React NativeExpo is a universal React app building platform that helps you rapidly develop, build, deploy and iterate mobile apps. It provides a range of tools that make developing with React Native simpler. Although you don’t require Expo to build React Native apps, it helps developers remove the need for basic native knowledge.Expo Go is an app that you can download to your phone to "see" your app in development.Expo CLI is a tool to build, manage and develop your apps.The Expo SDK is a set of modular packages that access native APIs such as Camera and Notifications.Expo Snack refers to a web-based playground. You can write and run React Native snippets in the browser.You will sometimes see a mention of Expo in the React Native documentation. It's the easiest way to start building your app, and there's no lock-in. Once you get started with Expo, you can always eject back into React Native.How does this work?Two important threads run in every React Native application. One of them is the main thread, which runs in every standard native app. It displays the elements of the user interface and processes user gestures.The second one is specific to React Native. Its function is to execute JavaScript code in a separate JavaScript engine. JavaScript is used to deal with the business logic of the app. It also defines the structure and functionality of the user interface. These two threads never communicate directly and block each other.Advantages of using React NativeTo avoid separate development, the logic layer can be reused to build the same app for both Android and iOS.React Native renders some code components with native APIs.If you know how to work with JavaScript, then you can easily work with React Native.To repair old applications, you only need to add React Native UI components, and there is no need to rewrite them.React Native adds React to applications, allowing easy use across various tools.It helps in creating an effective user experience without much effort.React Native VS React.js: ApplicationsFamous applications using React and React.jsStatisticsReact Native for a Mobile-First WorldThe main reasons to consider using React Native technology is the low app development cost and the potential for rapid application development. React Native works well if you are looking to build a single mobile application for two platforms such as iOS, Android where speed of operation is not important.Since React Native enables rapid application development, it is also a good tool for prototyping and rapidly delivering the idea to market for business validation.Another advantage of this framework is that it allows us to quickly provide new functionality on supported platforms.React Native uses the popular JavaScript language and ReactJS framework, which means that the number of experienced software developers available in the market is huge.
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Reactjs vs React Native – Key Difference, Ad...

Web development is a very important concept in the... Read More

What Are Higher-order Components in React?

In react, a higher-order component (HOC) is deemed an advanced technique for reusing component logic. They are not part of the React API, but they are the model that begins from React’s compositional nature. A higher-order function takes a function as an argument and returns a function. HOC is not a feature in React or any other programming language. It is a pattern that emerged from the components nature of React. Examples of the higher-order functions are the; .map, .filter, etc. How to Define a Higher Order FunctionExample 1: Function that takes another function as an argument object FunctionThatTakesFunction extends App {     def math(a:Int, b:Int, fun:(Int,Int)=>Int):Int = fun(a,b)     val sum = math(5, 6, (a,b) => a+b)     val diff = math(10, 4, (a,b) => a-b)     println(s"sum is $sum")     println(s"diff is $diff")   }  Output:  sum is 11   diff is 6  Example 2: Function that sums an array of numbers: function calculate(numbers) {    let sum = 0;    for (const number of numbers) {    sum = sum + number;     }   return sum;   }   calculate([1, 2, 4]); // => 7  Output  Sum = 7  Anonymous Functions  Before starting with higher-order functions, let us discuss anonymous functions. Anonymous functions are used in JavaScript to make the code easier to read. An anonymous function can be assigned to a variable or passed into other functions, like higher-order functions.  Anonymous functions, sometimes referred to as lambdas are often used when declaring higher-order functions or in cases where the function is only used once. The latter case is important when considering performance because it saves time and memory since anonymous functions do not need to be stored for later use.  For example, A simple anonymous function is like:  x -> x + 1  Here, the input of the function is x, and the output is x + 1.  The syntax for anonymous functions is slightly different in all languages, but it is usually written as (input) → (output).  Anonymous functions are often used because they avoid the boilerplate code associated with named function declarations. Therefore, for simple functions that do not need to be re-used across multiple places, such as the one above, an anonymous function may be more appropriate.Common Higher-Order FunctionsThere are a few higher-order functions that are essential to modern codebases. These provide a way to iterate or summarize lists of data. They make code much cleaner by dealing with common list operations instead of having to create a lot of helper code for basic list operations. The clarity in intent from using them is immensely helpful as well. Filter  The Filter is a function that accepts as an argument a test function that should return a boolean value and returns a new array with only those elements for which the test function returned true.   Map  The map is a function that turns one component into another component by adding a function to each element. It is a user's work to describe how to replace each element.  Reduce  The reduce function is a slightly different task than the previous one. It takes all the components in a group and adds them using binary values/operations to produce a single value. What are Higher Order Components?A higher-order component (HOC) is a distinctive element for reusing logic in React components. Members use one or more elements as arguments and return a new enhanced feature. Sounds familiar, right? They are similar to higher-order functions, which take some functions as an argument and produce a new function. HOCs are commonly used to compose components with shared behaviour. It combines differently from regular state-to-props patterns. Higher-Order Components(HOCS Facts)It doesn't modify or mutate components but creates new ones. They are used to compose pieces and can be reused. A pure function with no side effects and returns only a new feature. Examples of real-world HOCs:react-reduxConnect(mapStateToProps, mapDispatchToProps) (UserPage)react-routerwithRouter(UserPage)material-uiwithStyles(styles)(UserPage)Higher-Order Component StructureThe below snippet shows HOC structure in React: import React from 'react';  // Take in a component as argument InsideWrappedComponent const higherOrderwrappedComponent = (InsideWrappedComponent) => {  // And return another component    class HOC extends React.Component {      render() {        return ;      }    }    return HOC;  }; The higher-order component uses a component (InsideWrappedComponent) and returns another part inside it. As a result of this component’s logic, it can create a HOC out of that component and can be used and scaled wherever necessary. Some Points to RememberBefore using HOC, there are certain things that an individual should always keep in mind. These include the following:   Components should be pureSide effects of the HOC should be avoided. HOC should compose a component for reuse. Avoid the temptation to nutate the component passed as an argument. If the component is mutated the new behaviour would also be reflected outside the enhanced component and hence the component becomes non-reusable. Use composition instead of mutation. HOC convention namingChoosing a display name will help to debug/read the code properly. For example, if HOC is withLoadingIndicator and the input component is Component then the return component can have a display name as withLoadingIndicator(Component).Invoking HOC inside the render method should be avoidedInvoking the HOC inside the render refers to every time that the HOC component is rendered/ invoked. This results in performance degradation. It is better to invoke HOD from the outside component. Examplerender(){     const RenderedComponentDegrade = HOC(Component);     return ;   };   Creating the HOC inside the render leads to the creation of a new component. This leads to unmounting and remounting of the component, making the descendants lose their state.   Copying static methodsIt is important to declare static methods in the class. Binding the component where the static method is defined the component would not have access to a static method   Passing refsPassing props is not possible with refs as refs are not handled by React like ordinary props. We should use forwardRef API to handle this as a solution. Advantages of Using Higher-Order ComponentsHigh order components when used properly and efficiently are easy to handle  High order components help to get rid of mutating or comoving the same logic in each component created  Using High order components makes code more readable and efficient. Due to its proper naming conventions debugging of code becomes easy. Building Higher-Order Components - By Examples (2 - 3 examples)Higher-Order Component (HOC) refers to wrapping around "normal" components. It is a function that takes as input of one component and returns another component that wraps the original component.  A simple example below would help us to easily understand how this concept works.   Example One:Step 1: Create the React.js project. npm install -g create-react-app  create-react-app my-app-react  cd my-app-react  npm start Step 2: Create a file inside the src folder called HOC.js. // HOC.js  import React, {Component} from 'react';  export default function HocExample(HocComponentExample){      return class extends Component{          render(){              return (                                                                          );          }      }   }    Include function HocExample in the file App.js file  // App.js  import React, { Component } from 'react';  import HocExample from './HOC';  class AppExample extends Component {      render() {      return (                  Higher-Order Component First Example               )    }  }  AppExample = HocExample(AppExample);  export default AppExample; Explanation First, we have created a function that is HocExample inside the HOC.js file. HocExample function accepts one argument as a component.  Component is AppExample AppExample = HocExample(AppExample ); The component is wrapped inside another React component. It is easily scalable and can be modified. It is the primary application of the Higher-Order Components. Example Two: import React from 'react';    var newDataHOC = {      data: 'Example for high order component.',     }    var MyHOCExample = ComposedComponent => class extends React.Component {      componentDidMount() {         this.setState({            data: newDataHOC.data         });      }      render() {         return ;      }   };   class MyComponent extends React.Component {      render() {         return (                           < h1 >{this.props.data}                     )      }   }    export default MyHOCExample(MyComponent);  Note − Data is Passed to MyComponent. The MyHOCExample is a higher-order function that passes data to MyComponent. This function takes MyComponent, enhances with newDataHOC, and returns the enhanced component that is rendered on the screen.   Using HOC would help our app to maintain easily, efficiently and also help to upgrade.  Example Three: Checking authentication using HOC A component that would be displayed if the user is logged in. Create a HOC component that checks the authentication on each render(): AuthenticatedUserComponent.js import React from "react";  export function requireAuthenticationExample(Component) {      return class AuthenticatedExampleComponent extends React.Component {          isAuthenticated() {              return this.props.isAuthenticated;          }            /**           * Render           */          render() {              const loginErrorMessage = (                                        Please login To view this part of the application.                                );                return (                                        { this.isAuthenticated === true ? : loginErrorMessage }                                );          }      };  } export default requireAuthenticationExample; Use Higher Order Component in our components that would be hidden from anonymous users:  import React from "react";  import {requireAuthenticationExample} from "./AuthenticatedExampleComponent";  export class MyPrivateComponentExample extends React.Component {      /**       * Render       */      render() {          return (                                Viewable only to anonymous users. This is a secret search and hidden from other users.                        );      }  } export default requireAuthenticationExample(MyPrivateComponentExample); Debugging HOCsHOCs debugging including printf statement Editing the source code of the application to log the application state at the appropriate points, either through print statements or a logging framework.  Compiling and running the application viewing debugging statements emitted by the application at runtime   Debugging with print statements is crude, but fast and easy. One downside is that adding a print statement inherently changes the flow of the program, which may or may not be important. Additionally, an individual print statement inherently gives no indication of where in the code it was emitted. With a small number of debugging print statements, this may not be a problem. With a large number of print statements, they can be difficult to sort out and understand.  A logging framework provides several advantages over print statements. Logging frameworks usually provide some sort of log routine, which is used to emit a message with the corresponding priority. The framework itself directs the output to some destination, along with useful information such as timestamps, the name of the class or source file that contains the log statement, and even line code line numbers.   Similarly, the logging framework can filter logged messages based on priority or logging level or disable logging at all. For this reason, in contrast to the transient nature of printf statements, logging statements are usually kept indefinitely in the codebase, making it a deployment-time decision whether to log them to a file.  Summing up Higher-order functions in JS are special functions that accept functions as arguments or return them. Furthermore, if only primitives are used by functions/components as arguments or return values, then these are first-order functions. HOC offers reusability benefits: Higher-order functions provide the core behavior itself, and with the acceptance of function as an argument you can extend that behavior. 
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What Are Higher-order Components in React?

In react, a higher-order component (HOC) is deemed... Read More

Understanding Constructors With React Components

The React Constructor is a method that’s automatically called during the creation of an object from a class. Simply put, the constructor, like its name, is a great tool to build things.Constructors are used for two key objectives:To initialize the local state of the component by assigning an object to this.stateTo bind event handlers that occur in the componentIn this blog, we’ll take you through all you need to understand about React constructors including the rules to be followed while implementing them. We will also look at how to bind events all in one place and take note of how to assign values accurately.What is a Constructor?In a class, a constructor is a method that is automatically called when an object of that class is created. Typically, this is how it works:Syntax:Constructor(props){     super(props);   }A couple of points to note about a constructor are:It is not necessary to have a constructor in every component.It is necessary to call super() within the constructor. To set property or use 'this' inside the constructor it is mandatory to call super().We must remember that the setState() method cannot be used directly in the constructor(). Use 'this.state' to assign the initial state in the constructor. The constructor uses this.state to assign initial state, and other methods should use set.state().Call super(props) Before Using this.propsIn React, the constructor is called during component creation and before mounting. If you want to implement the constructor for a React component, call the super(props) method before any other statement. Otherwise, this. props will be undefined in the constructor and create bugs.constructor() {  console.log(this.props); }Using super(props) is simple. We just have to call it in the constructor method of our child component:constructor(props) {  super(props);  console.log(this.props); }Never Call setState() Inside constructor()The constructor is the ideal place to set up your component's initial state. Instead of using setState() in other methods, you will need to assign the initial state directly.class Hello extends React.Component {    constructor(props) {    super(props);    this.setState({   title: 'This is the first test'    }); }     render() {     return {this.state.title}   } }   ReactDOM.render(, document.getElementById('container'));When you use the setState() method in React, it does more than just assign a new value to this. state. It also re-renders the component and all its children. Additionally, if you are trying to update a class that was defined inside of a constructor, you will receive an error, so we should avoid setState() in constructors because it is the only place we directly assign the initial state to this.state.constructor(props) {  super(props);  this.state = {    name 'kapil',    age: 22,  }; }When creating a component, you should avoid setting values directly from the component's properties. Do it as follows:constructor(props) {  super(props);  this.state = {    name: props.name,  }; }If you try to change the name property in the state object, it will not work. If you want to modify this property later, you should not use setState(). Instead, access the name property directly in your code by using this.props. name instead of assigning it directly to the state.Bind Events All in One PlaceIn the constructor, you can bind event handlers easily:constructor(props) {  super(props);  this.state = {    // Sets that initial state  };  // Our event handlers  this.onClick = this.onClick.bind(this);  this.onKeyUp = this.onKeyUp.bind(this);  // Rest Code }Avoid Assigning Values from this.props to this.stateIt might be tempting to set the component's state right away, but this could cause a few issues. One issue is that you can't really test it properly until the API call has been made and the response received. Another reason to avoid setting state in the constructor is that you don't need to worry about that value again once it's been defined.While this may seem the obvious approach, the constructor function is not always the right place to do API calls. If your component relies on another state that is available in its parent or grandparent components, then you may want to consider making API calls in componentDidMount(). This way you don't need to make API calls multiple times.constructor(props) {   super(props);     this.state = {    Reptile: 'Alligator',   }; }Do You Even Need a Constructor?React components have a useful feature as constructors. Constructors are difficult to manage. Don’t define the constructors if the state in the components would not be maintained. React applications are built using functional components and if state or event handlers are not required then it is better not to have the class components.Arrow FunctionsArrow functions make it possible to write more concise code, and they also help you to use the ‘this’ binding correctly. If you're using arrow functions, then you don't need to bind any event to 'this'. The scope of 'this' is global and not limited to any calling function.import React, { Component } from 'react'; class App extends Component {     constructor(props){       super(props);       this.state = {            data: 'ABC'         }     }     handleEvent = () => {       console.log(this.props);     }     render() {       return (               React Constructor Example                 Please Click               );     }   }   export default App;The use of a constructor1) Initialization of the state constructorclass App extends Component {     constructor(props){           // here, it is setting initial value for 'inputTextValue'           this.state = {               inputTextValue: 'initial value',           };     }   }2) The way to use 'this' inside the constructorclass App extends Component {       constructor(props) {           // when you use 'this' in constructor, super() needs to be called first           super();           // it means, when you want to use 'this.props' in constructor, call it as below           super(props);       }   }3) Initialization of third-party librariesclass App extends Component {       constructor(props) {           this.myBook = new MyBookLibrary();          //Here, you can access props without using 'this'           this.Book2 = new MyBookLibrary(props.environment);       }   }4) Binding some context(this) when we need a class method to be passed in props to children.class App extends Component {     constructor(props) {            // when you need to 'bind' context to a function           this.handleFunction = this.handleFunction.bind(this);       }   }Example Program:React Component with Constructorindex.js  import React from 'react';  import ReactDOM from 'react-dom';  class Main extends React.Component {    constructor() {      super();      this.state = {        planet: "Earth"      }    }    render() {      return (        < h1 >Hello {this.state.planet}!      );    }  }  ReactDOM.render(, document.getElementById('root')); Output: Hello Earth! React Component without Constructor Index.js  import React from 'react';  import ReactDOM from 'react-dom';  class Main extends React.Component {    state = {      planet: "Mars"    }    render() {      return (        < h1 >Hello {this.state.planet}!      );    }  }  ReactDOM.render(, document.getElementById('root')); Output: Hello Mars! Constructor vs getInitialStateThe constructor and getInitialState in React are used to initialize state and they can’t be used interchangeably. The main fundamental difference between ES5 and ES6 is in the new class keyword. ES5 didn't provide the convenience of defining the React component as classes however ES did provide the convenience to define react component as class.  getInitialState is the ES5 friendly method to define the initial state of a React component. We use getInitialState with React.createClass and constructor is used with React.Component. For example class Goodmorning extends React.Component {    render() {      return Good Morning;    }  } It would rely on helper module called create-react-class:  var createGoodmorningReactClass = require('create-react-class');  var Goodmorning = createReactClass({    render: function() {      return Good Morning;    }  });  The object passed into create-react-class that is defined in initial stage by calling the getInitialState attribute:   var Goodmorning = createReactClass({    getInitialState: function() {      return {name: this.props.name};    },    render: function() {      return Good {this.state.name};    }  });  In ES6 implementation:  class Goodmorning extends React.Component {    constructor(props) {      super(props);      this.state = {        name: props.name      }    }    render() {      return Good {this.state.name};    }  } Does the Constructor Remain Relevant? React is an extremely powerful JavaScript Framework. Understanding how well its component lifecycle works would help to unlock the potential and power of the React JavaScript Framework.  As we have seen in this blog, as you build React components, the constructor is one of the features that isn’t supported in functions.  A constructor lets you define variables and initialize them with default values for the sake of convenience. However, if there is no state initialization or method binding, we do not need to define a constructor for a component in JavaScript. As illustrated in this case, we would not fetch data from the constructor and neither would binding methods be necessary to set the initial state. Like they say, it’s important to know the rules to know which ones can be broken. It’s a good method to learn about for when you might want to create several instances of a class with varying values for member functions.  
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Understanding Constructors With React Components

The React Constructor is a method that’s automat... Read More

Top SAFe Certifications

Many companies have a challenge using Agile as they move from a long-standing command-and-control mentality to a system that has Agile entrenched in it. Agile is a software development methodology that involves getting solutions from the collaboration of cross-functional and self-organizing teams and their customers. Certifications in Scaled Agile Framework, also known as SAFe, validate your Agile skills and expertise.Recently, the Scaled Agile Framework (SAFe) gained recognition as one of the most common ways for scaling Agile, which grew the demand for the program exponentially. Over 70% of Fortune 100 companies are now using SAFe for their agile needs. Many organizations are looking for professionals with credentials that indicate their competence to operate in a SAFe environment, and a SAFe Certification can evidence this.Which are the Top SAFe® Certifications?There are several SAFe certifications available. These certifications are great for people who want to support the transformation of companies into Agile enterprises. Some of the top SAFe certifications include:  Implementing SAFe®SAFe® Release Train Engineer (RTE)SAFe® ArchitectSAFe® Agilist / Leading SAFeSAFe® DevOps Practitioner  SAFe® Program Owner/ Program ManagerSAFe® Scrum MasterSAFe® Advanced Scrum MasterSAFe® Practitioner / SAFe® for teamsLet's look at each of these certifications and what they offer.1. Implementing SAFe®This is a four-day course that helps participants learn how to lead a Lean-Agile transformation by utilizing the Scaled Agile Framework (SAFe) principles and practices to gain agility in business. Some subjects covered in this course include Agile product delivery, team, and technical agility, implementing enterprise SAFe, and the core competencies of lead portfolio management.Demand and benefitsThis certification is in high demand from organizations that want to plan and execute the Agile Release Trains (ARTs) and those looking to launch ARTs as solutions. Some benefits include:Worldwide recognition. With more and more businesses embracing SAFe, Scaled Agile qualifications are some of the most sought-after certifications. Scaled Agile continually improves its material to make it more robust and flexible to satisfy market demands and stay on top of the industry.Resolving enterprise complexities. SAFe allows numerous scrum teams to collaborate on a complicated project. SAFe is a highly transparent, basic, and easy approach that operates on a set of principles and aids in developing effective solutions.Top industries hiringTop industries hiring Implementing SAFe certified professionals are the professional service industry, the software engineering industry, the project management industry, and the product development industry.Where to take training for certificationThe Agile Center KnowledgeHut The Project Management Academy Other certified training centersWho should take the training (roles) for certification?Project managersBusiness analystsScrum mastersAgile coachesRelease Train EngineersDevelopment managersConsultantsSoftware engineersProduct ownersManagersDirectorsProfessional service consultantsDuration to get certifiedAfter completing the 4-day SAFe course, you have to take the SAFe® Program Consultant Exam. On passing the exam, you will gain the Certfieid SAFe® Program Consultant credential.  This SAFe certification is valid for a year, after which you have to renew it by paying a renewal fee.Course fee for certificationThe fee for the Implementing SAFe training course varies depending on your locationApplication fee for certificationThe application fee is included in the Implementing SAFe course fees.  The annual renewal cost is $895.Exam fee for certificationThe first exam attempt is included in the course fee.Retake fee for certificationThe Implementation SAFe exam retake fee is $250.2. SAFe® Release Train Engineer (SAFe RTE)This three-day course covers the roles and responsibilities of a Release Train Engineer. Some areas of competency for the SAFe RTE include organizing ceremonies at the program level, executing the program, and coaching Agile Release Train teams to enhance value delivery continuously. This course teaches how to build a high-performing Agile Release Train, facilitate value from one end to another, and implement a program increment event.Demand and benefitsThis certification is in demand from organizations that want a leader in charge of driving value in a value stream or a single program. Some benefits include:  More opportunities. As a result of the certification, you are automatically chosen for further collaboration at the outset, as you will be meeting the key demands of an enterprise.Profile boost. This is one of several reasons why businesses actively seek employees with SAFe certificates rather than hiring someone in-house or without a SAFe credential. As a certified release training engineer, you will be fully responsible for an Agile Release Train by organizing and guiding the team.Top industries hiringTop industries hiring SAFe RTE professionals are the engineering industry, the IT industry, the product development industries, and the software engineering industry.Where to take training for certificationThe Agile CenterKnowledgeHutThe Project Management AcademyOther certified training centerWho should take the training (roles) for certificationProgram managerRelease train engineerAgile coachScrum masterIT managerDirectorProduct ownerDuration to get certifiedAfter completing the SAFe RTE course, you can take the SAFe Release Train Engineer exam. On passing the exam you become a Certified SAFe® Release Train Engineer.  This SAFe RTE certification is valid for a year, after which you have to renew it.Course fee for certificationThe fee for the course varies depending on your location. It is between $1200- $2000.Application fee for certificationThe application fee is included in the SAFe RTE course fees. Renewal fee is $295.Exam fee for certificationThe exam fee for your first SAFe RTE test is included in the course fee, which means that it not be paid for separately.Retake fee for certificationThe SAFe RTE exam retake fee is $50.3. SAFe ®  ArchitectThis is a three-day course where attendees look into the responsibilities, roles, and mindset of Agile Architects. It covers how to obtain an alignment between business values and architecture. It also looks at how to drive continuous flow to huge systems as you support program implementation.Demand and benefitsThis SAFe certification for Architects is in demand across industries, where enterprise, solution, and system architects are required to create architectural solutions. Some benefits include:Skills to facilitate enterprise growth. SAFe Architect certification and training equip you with the skills needed to build a continuous delivery pipeline for an enterprise or a growing organization.  Exposure to new processes. It will not only assist you with SAFe, but it will also expose you to new market trends in processes and procedures.Top industries hiringTop industries hiring SAFe Architect professionals are the software engineering industry, the construction industry, product development industries, the professional service industry, and the financial services industry.Where to take training for certificationThe Agile CenterKnowledgeHutThe Project Management AcademyOther certified training centerWho should take the training (roles) for certification?Project managersBusiness analystsScrum mastersAgile coachesRelease Train EngineersDevelopment managersConsultantsSoftware engineersProduct ownersManagersDirectorsProfessional service consultants.Duration to get certifiedAfter completing the SAFe For Architects course, you can take the SAFe Architect exam. On passing the exam you will be SAFe Architect certified.  This SAFe certification is valid for a year, after which you have to renew it.Course fee for certificationThe fee for the course varies depending on your location. Costs are approximately around $2500 for this course.Application fee for certificationThe application fee is included in the Implementing SAFe course fees.  The annual renewal cost is $100.Exam fee for certificationThe exam fee for your first SAFe Architect test is included in the course fee.Retake fee for certificationThe SAFe Architect exam retake fee is $50.4. SAFe® Agilist / Leading SAFe®This is a two-day course where attendees learn how to master business agility and why it is important. It provides an understanding of implementing Lean portfolio management in an organization and how to instill a DevOps culture. Some of the concepts included in this course are the principles of SAFe, system thinking, Agile development, and Lean product development.Demand and benefitsLead-Agile enterprises that are looking to leverage SAFe, drive the demand for this certification. The key benefit of taking this course is the attractive renumeration that this certification commands. The salary compensation is one of the most compelling and promising incentives for pursuing SAFe certification and training. If you are qualified in SAFe, you will see a significant increase in your pay. Professionals with SAFe Certification are paid around 25% more than those who do not have SAFe certification, according to statistics.Source:https://www.knowledgehut.com/info/agile-management/safe-agilist-certification-valuehttps://staragile.com/blog/reasons-to-get-safe-agile-certification-traininghttps://6figr.com/in/salary/safe--sTop industries hiringTop industries hiring SAFe Agilist professionals are the financial industry, the IT industry, software development industries, and industries that utilize project management.Where to take training for certificationThe Agile CenterKnowledgeHutThe Project Management AcademyOther certified training centerWho should take the training (roles) for certification?Project managersScrum mastersRelease Train EngineersDevelopment managersConsultantsSoftware engineersProduct ownersProfessional service consultantsBusiness analystsManagersDirectorsAgile CoachesDuration to get certifiedAfter completing the Leading SAFe course, you can take the SAFe Agilist exam. Passing the exam will get you the SAFe Agilist credential.  This SAFe Agilist certification is valid for a year, after which you have to renew it.Course fee for certificationThe fee for the course varies depending on your location. Most centres charge around $2500 for this course.Application fee for certificationThe application fee is included in the course fees.  The annual renewal cost is $100.Exam fee for certificationYour first attempt of the SAFe Agilist exam is included in the course fee.Retake fee for certificationThe SAFe Agilist exam retake fee is $50.5. SAFe® DevOps PractitionerEvery organization must provide useful technological solutions at the pace of business to thrive in the current disruptive global market, and this is what the SAFe DevOps Practitioner course is about. This is a two-day course that teaches participants how to collaborate across non-technical, technical, and leadership positions so as to maximize their value stream from the start to the end.Demand and benefitsThe need for cross-functional teams that can execute implementation strategies drives the demand for this certification. Some benefits include:Continuous delivery pipeline. With the SAFe certification, you learn how to develop and integrate DevOps, where the client receives continuous delivery from a large team.  Understanding of DevOps technologies. You get to learn how to use DevOps technologies and acquire a better grasp of the other tools and techniques needed for continuous delivery.Top industries hiringTop industries hiring SAFe DevOps professionals are the investment banking industry, the professional service industry, the construction industry, and the product development industries.Where to take training for certificationThe Agile CenterKnowledgeHutThe Project Management AcademyOther certified training centerWho should take the training (roles) for certification?Project managersScrum mastersRelease Train EngineersDevelopment managersConsultantsSoftware engineersProduct ownersProfessional service consultantsBusiness analystsManagersDirectorsAgile CoachesDuration to get certifiedAfter completing the SAFe DevOps course, you can take the SAFe DevOps Practitioner exam. On passing the exam, you will get the certification.  This SAFe DevOps Practitioner certification is valid for a year, after which you have to renew it.Course fee for certificationThe fee for the course varies depending on your location. You would be required to pay around $1200 for this course.  Application fee for certificationThe application fee is included in the course fees.  The annual renewal cost is $100.  Exam fee for certificationYour first attempt of the SAFe DevOps Practitioner exam fee is included in the course fee.Retake fee for certificationThe SAFe DevOps exam retake fee is $50.6. SAFe® Program Owner/ Program ManagerThis two-day course covers how to use Lean thinking in decomposing Epics into stories and features. Some concepts covered in the course include how to refine features into stories, plan and implement program increments and iterations, and manage team backlogs and programs.  Demand and benefitsThe highest demand for this certification is in lean enterprises that have multiple teams and programs. Benefits include:Handling complex projects. To benefit from this methodology and implement it in your projects, you must have a full understanding of it. SAFe certification and training will teach you all you need to know about SAFe.Worldwide recognition. You can seek your ideal job in your dream country or company if you have a SAFe certification. This accreditation is widely recognized and in high demand across the world.Top industries hiringTop industries hiring professionals with this certification are industries that utilize project management, including the manufacturing, construction, architecture, engineering, and real estate development industries.Where to take training for certificationThe Agile CenterKnowledgeHutThe Project Management AcademyOther certified training centerWho should take the training (roles) for certification?Software engineersProduct ownersProject managersScrum mastersRelease Train EngineersDevelopment managersConsultantsProfessional service consultantsBusiness analystsManagersDirectorsAgile CoachesDuration to get certifiedAfter completing the SAFe Product Owner/Product Manager course, you can take the SAFe Product Owner/Product Manager exam. On passing the exam you will get the Certified SAFe® Product Owner/Product Manager credential.  This SAFe certification is valid for a year, after which you have to renew it.  Course fee for certificationThe fee for the course varies depending on your location. Most centres will charge $1200 for this course.  Application fee for certificationThe application fee is included in the course fees.  The annual renewal cost is $100.  Exam fee for certificationYour first attempt of the SAFe® Product Owner/Product Manager exam is included in the course fee.  Retake fee for certificationThe SAFe PO/PM exam retake fee is $50.SAFe® Scrum MasterThis two-day course aims to grant attendees an understanding of what the role of Scrum Master in an enterprise entails. This course gives a focus to the basics of team-level Scrum and also explores what the role of a Scrum Master is. It teaches how to successfully plan and implement Program Increment throughout the different levels of an organization.  Demand and benefitsThe need to understand how Scrum can be executed in the whole organization and the main components of Agile regarding scaling development has increased the demand for this certification. Other benefits include:  It adds weight to your resume. Including a SAFe certification in your resume distinguishes you from the competition. It gives your CV a lot of weight and is in high demand all around the world.It increases your salary. You can expect a salary hike in your current job or a good hike in your next job if you are SAFe Scrum Master certified.Top industries hiringThe top industries hiring SAFe Scrum Master Professionals are the investment banking industry, the engineering industry, and the construction industry.Where to take training for certificationThe Agile CenterKnowledgeHutThe Project Management AcademyOther certified training centerWho should take the training (roles) for certification?ConsultantsProfessional service consultantsBusiness analystsManagersDirectorsAgile CoachesSoftware engineersProduct ownersProject managersScrum mastersRelease Train EngineersDevelopment managersDuration to get certifiedAfter completing the SAFe Scrum Master course, you can take the SAFe Scrum Master exam. On passing the exam you will get the Certified SAFe® Scrum Master  credential.  This Certified SAFe® Scrum Master certification is valid for a year, after which you have to renew it.  Course fee for certificationThe fee for the course varies depending on your location. The approximate charges are $1200 for this course.  Application fee for certificationThe application fee is included in the course fees.  The annual renewal cost is $100.  Exam fee for certificationYour first attempt of the SAFe Scrum Master exam is included in the course fee.Retake fee for certificationThe SAFe Scrum Master Exam retake fee is $50.7. SAFe® Advanced Scrum MasterThis is a two-day course meant to prepare Scrum Masters for leadership roles in organizing teams, implementing the Scaled Agile Framework (SAFe), and facilitating enterprise success. Some subjects covered in this course include executing programs, improving them continuously, and facilitating cross-team interactions.  Demand and benefitsAs more organizations implement actionable tools for building teams, they seek people with this certification to support this growth. Benefits of SAFe Advanced Scrum Master are:Scaling an Agile company. SAFe certification offers a deep understanding of concepts and procedures and knowledge of different elements of working in a scaled agile company that you wouldn't have otherwise.International recognition. SAFe certifications are valued internationally, and every IT organization around the globe recognizes them and regards them as niche qualifications.Top industries hiringTop industries hiring professionals with this certification are the industries that use project management, such as the manufacturing and construction industries and product development industries.  Where to take training for certificationThe Agile CenterKnowledgeHutThe Project Management AcademyOther certified training centerWho should take the training (roles) for certification?ManagersDirectorsAgile CoachesSoftware engineersProduct ownersProject managersScrum mastersRelease Train EngineersDevelopment managersConsultantsProfessional service consultantsBusiness analystsDuration to get certifiedAfter completing the SAFe Advanced Scrum Master course, you can take the SAFe Advanced Scrum Master exam. Passing the exam will make you Certified SAFe® Advanced Scrum Master.  This SAFe certification is valid for a year, after which you have to renew it.  Course fee for certificationThe fee for the course varies depending on your location. Fees are about $1200 for this course.  Application fee for certificationThe application fee is included in the course fees.  The annual renewal cost is $100.  Exam fee for certificationThe exam fee for your first test is included in the course fee.Retake fee for certification The exam retake fee is $50.8. SAFe® Practitioner / SAFe® for teamsThis two-day course provides you with the skills you need to become a team member contributing highly to an Agile Release Train. Each person learns how to deliver value in a team and what they can do to better perform their role in XP, Kanban, and Scrum. It also covers why the DevOps culture is important, integrating the continuous delivery pipeline and improving continuously.  Demand and benefitsEvery company with an Agile Release Train needs a SAFe practitioner who is high performing in the team, which is why there is demand for this certification. Other benefits include:  Salary boost. Because scaling Agile is a specialized expertise, SAFe specialists are well compensated. The certificate also boosts your employability by enhancing your reputation and making you market-ready.Continuous delivery. SAFe training prepares professionals to work with a team to handle an increasing quantity of work by attaining Continuous Delivery, which allows for more frequent updates.Top industries hiringThe top industries hiring professionals with this certification are the professional service industries, the IT industry, product development industries, and the software development industry.Where to take training for certificationThe Agile CenterKnowledgeHutThe Project Management AcademyOther certified training centerWho should take the training (roles) for certification?ManagersDirectorsAgile CoachesSoftware engineersProduct ownersProject managersScrum mastersRelease Train EngineersDevelopment managersConsultantsProfessional service consultantsBusiness analystsDuration to get certifiedAfter completing the SAFe For Teams course, you can take the SAFe Practitioner exam. Clearing the test will make you a Certified SAFe Practitioner.  This SAFe certification is valid for a year, after which you have to renew it.  Course fee for certificationThe fee for the course varies depending on your location. Fees are about $1200 for this course.  Application fee for certificationThe application fee is included in the course fees.  The annual renewal cost is $100.  Exam fee for certificationYour first attempt of the Certified SAFe Practitioner exam is included in the course fee.Retake fee for certificationThe exam retake fee is $50.Agile frameworks aren't new, and they've been around for a long time. Industry experts feel that instructor-led agile training certifications may enhance a company's entire culture. SAFe certification will help you grasp the complexities of scaling agile at the corporate level.Big companies may use SAFe to apply agile methodologies to their existing projects, allowing large teams to operate more efficiently. Successfully scaling agile methods to enterprise levels requires some degree of SAFe understanding, skill, and expertise. SAFe is among the few frameworks which have integrated lean and system thinking alongside Agile development effectively.Having a SAFe certification makes it possible for you to advance in your professional career. Once you hold this certification, you can verify that you have what it takes to help scale Agile. These certifications will help you move from being a SAFe practitioner to being a SAFe Expert.
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Top SAFe Certifications

Many companies have a challenge using Agile as the... Read More

How To Install and Setup React Native on Mac

React Native Development Environment Installation:With the rapid growth of online websites, businesses, and the general ecosystem, it is crucial that website UIs load quickly on smartphones to encourage smartphone-based internet consumption. Facebook developed React Native from a need to generate UI elements efficiently, which formed the basis for creating the open-source web framework. Its native cross-platform capabilities allow usage for a wide range of platforms for application development, including Android, Web, Windows, UWP, tvOS, macOS, iOS, and AndroidTV. Microsoft also released a preview release in May 2020 that expanded the range of the React Native world, allowing desktop app development. React Native runs in the background of the destination device, and then communicates with the native platform via a batched asynchronous bridge. Its three main advantages are:It allows faster development due to its native natureThough it has a syntax styling similar to CSS or HTML, it is much quicker and efficientIt is flexible as it allows developers to write native code in various languages, including Java, Kotlin, and Swift.This article is about how to install and configure React Native CLI environment. First, we will learn how to install the framework, then check whether it works well and finally develop an app.PrerequisitesBasic computer proficiencyAn account with Administrative privileges on your computerAccess to the outlined documents and softwareA working internet connection to download the installation filesAudienceThis article guides first-time React Native users, junior developers, and developers with no experience with React Native. If curiosity nudged you to learn the framework due to the hype around React, then this is the guide you need.System requirementsSoftwareXcode version 11.3.1 or newer is required. Nodejs version 12 LTS or newer is required.HardwareMacOS requires a Mac device to operateRam - 4GBStorage - 10GBThese requirements ensure your tools run quickly and have enough storage for installation and development.System RequirementsReact Native requires macOS High Sierra (10.13) or higher to run efficiently.Installation through HomeBrew:HomeBrew is a package manager that helps you install and manage packages on Mac, and thus it will be essential to our installation process. You will install HomeBrew so that you can use it to install all the other tools necessary for React Native environment, including Nodejs, git, Watchman, and JDK.First download HomeBrew using the above link, then execute the command below in the Command Line Interface:brew—versionThe command verifies whether HomeBrew has been successfully installed and outputs the specific version installed as the following result shows:homebrew 2.1.7 homebrew/homebrew-core (git revision f487; last commit 2020-05-26)When the version is unavailable, you can install HomeBrew via this code:/usr/bin/ruby -e “$(curl –fsSL https://raw.githubusercontent.com/HomeBrew/install/master/install)”After installation, check whether HomeBrew has installed properly using the following command:brew--versionIf the software is well installed, the result will show the version and date as shown:homebrew 2.1.7 homebrew/homebrew-core(git revision f487; last commit 2020-05-26)NodejsReact Native is a JavaScript platform; hence it needs Nodejs to provide a JavaScript runtime.  Nodejs also provides essential tools such as a local webserver with live reloading, network tools, command-line tools, and web APIs.Use the HomeBrew command below to install Nodejs:brew install nodeCheck whether the installation is successful through the following command:node—versionIf the installation has occurred successfully, the Nodejs version will show up:V12.6.0Installation of Nodejs also includes installation of npm, the Node Package Manager. It would help if you had npm to help you install packages, libraries, and vital tools for your React development environment. To verify if npm is successfully installed, execute the following command:npm—versionIf the installation is successful, you will see the version as shown below:6.9.0WatchmanWatchman monitors the files and folders utilized by the framework and triggers specific actions if the files are modified. It would be best if you had Watchman for React Native to monitor source codes and rebuild them once they are changed.To install Watchman, execute the command below:brew install watchmanVerify installation through:watchman --versionif properly installed, the result will show the version as shown below:4.9.0React Native CLIYou need React Native CLI to develop the app by react-native. React Native CLI is installed by executing the npm command below:npm install --g react-native-cliCheck if the installation is successful using the following command:react-native --versionSometimes, users may get an error when using the npm install --g react -native-cli command. To avoid this, try entering sudo before this command, then enter your system password.If the installation is successful, you will see the version as shown:react-native-cli:2.0.1 react-native:n/a - not inside a React Native ProjectXcodeYou need Xcode for iOS app development, and you can download it via the above link. After installation, configure the Command Line Tools. Execute Xcode and go toXcode > Preferences > LocationsYou should see the Command Line Tools settings showing the version of Xcode as:Xcode 10.2.1 (10E1001)If the settings do not look like that, select the last version of the Command Line Tool from the dropdown menu.Go to components and select an iOS emulator, then download it (this is for those without iOS devices to run and test their apps on. It is also easier than using an actual device.)Move account tabs, select apple id, and input your apple id.Open Xcode and create a new project, name it anything, then close it. After project creation, click the root file and select "sign in and capabilities," then select your user id. Select your emulator and keep it ready for development.CocoapodsCoacoapods manages dependencies in iOS development, and thus it is necessary to develop an app by react-native.Install Cocoapods through the following command:sudo gem install cocoapodsVerify installation through:pod --versionif installation is successful, you can see the version as shown below:1.7.5JDKThe Java Development Kit is essential for the development of Android apps with react-native. Install JDK through the command below:brew tap AdoptOpenJDK/openjdk brew cask install adoptopenjdk8Verify installation through:java -versionIf you see the Java version as shown below, then Java has been successfully installed:openjdk version "1.8.0_222" OpenJDK Runtime Environment (AdoptOpenJDK)(BUILD 1.8.0_222-b10) OpenJDK 64-Bit Server VM (AdoptOpenJDK)(build 25.222-b10, mixed mode)JDK Installation also installs the Java Compiler, which can be verified by executing the following command:javac -versionIf the installation is successful, the following result shows up:javac 1.8.0_222Android StudioAndroid Studio is also an essential tool for developing an Android app using react-native.CONFIGURATIONOn the install type screen, select the custom option, choose your preferred theme, then select the performance (Intel R HAXM) option and Android Virtual Device option. Click Next, then leave the Emulator settings as they are, and click next again. Allow the standard installation to continue and click Finish to complete the process.ANDROID STUDIO SDK CONFIGURATIONClick Configure>SDK Manager and proceed to Android SDK Configuration.Select the Show Package Details option and select the following options:Android SDK Platform 28Intel  X86 Atom System ImageGoogle APIs Intel x86 Atom System ImageGoogle APIs Intel x86 Atom_64 System ImageClick ok to install the options selected.In the SDK Tools Window, select show package details >Android SDK Build Tools >Android SDK Build Tools 23.0.1.ANDROID STUDIO ENVIRONMENT VARIABLE CONFIGURATIONYou need to set environment variables to ensure the development environment fits your specifications.  Ensure that the ANDROID_HOME environment variable connects to your existing Android SDK to avoid complications.Open and include the following code to the ~/.bash_profile file or the ~/.zshrc file to add the environment variables:For .bash_profile users, use the following command:source ~/.bash_profileAfter configuration, restart the terminal, then execute the following command: adbThe correct result if all variables are successfully configured is:Android Debug Bridge Version 1.0.41 version 29.0.1-5644136 Installed as /Your Android SDK Directory Location/platform-tools/adbGit1.You can also use git, which comes with Xcode. However, if its unavailable, run the code below:brew install gitgit is a substitute for the Android Studio development environment.Gradle DaemonSometimes you may need to modify the java code, in which case, your development speed will be affected. Gradle Daemon is a tool that manages these changes to speed up your development.Other Installation MethodsExpo CLIExpo CLI is a tool built to install and manage react-native frameworks. However, its unsuitable feature is that it has numerous native features, which makes building an app tedious and also makes the app size more extensive than it needs to be. Additionally, incorporating elements in an app that are not available in Expo CLI is difficult, making the tool unsuitable for developers. Despite that, Expo CLI has many useful native tools, unlike React Native CLI, such as geolocation, camera, the microphone that can come in handy for most application needs. Expo CLI is a much easier route than the react-native CLI route.The installation process is as follows:1.Install the Expo CLI command line utility using:Npm install –g expo-cli2.Run the command below to create your first project:expo init my app3. Browse to the directory with the following command in the terminal:4. Finally, run the projectExpo start5. A development environment server will be started by these commands. Running the app requires installing the Expo client app to your device (iOS/Android) then connecting it to your computer. Android requires scanning the QR code on the terminal to authenticate the project, while iOS requires QR code scanning using the camera app. On the Android (emulator/real device), use the following command to initialize the app:npm run android6. While on the iOS emulator run:npm run iosExpo has docs that you can reference for solutions or even utilize the Expo Forums created for the Expo community to ask questions.Expo is mostly best suited for beginners as it does not include the use of native code thus cannot be used to develop complex applications with custom components.TestingProject structureReact Native project structure consists of a project directory with configuration files such as package.json, app.json, .watchman.json at the root; separate Android and iOS folders; a _tests_ folder with validation tests for the project; a nodes_module for housing smaller app modules; and an index.js file that maps the application and serves as the initialization point of the application. package.json  specifies project dependencies and versions, while app.json contains the app name.The npm (node package manager) manages the node_modules folder, which stores all the project library dependencies. You should avoid modifying the files present in the folder since alterations performed cannot be assured to be stable from updates/installs. Assets in the public folder are to be shared publicly. The src folder contains all development work by the developer, including components and source codes.Developing an app1. First, you need to lock the version you build with to ensure the app still works even after updates, using the following command:npm config set save-exact=true2. Create a native project through the command:react-native init AwesomeProject cd AwesomeProject react-native run-iosYour new app will run successfully in the emulator.3. In iOS, execute the command below:cd SampleApp #react-native run ios npm run iosThe react-native app will show up on the emulator.4. On Android, run the following command:cd SampleApp #react-native run-android npm run androidYour Android emulator will output:Welcome to ReactSecond App VerificationHello World is a simple program for most development environments. Open index.ios.js for iOS or index.android.js for Android, then proceed to delete everything between the tags .  Write Hello World and execute the emulator.The result will be Hello World on the screen.Modifying Your AppAfter successful testing, you can modify your app through the following steps:Open index.ios.js or index.android.js and edit some files.Click CommandX + R in the iOS Emulator and reload to see changes.Potential issuesYou might encounter problems while installing Cocoapods or React Native CLI - the most probable solution is entering a sudo command before the installation command, which will prompt you for your system password. Input the password, and your installation will go through just fine. You might also get this result [Broken AVD system path. Check your ANDROID_SDK_ROOT value]. Check if you installed android -sdk using homebrew; if you did, then uninstall it through the following command: brew uninstall android-sdk Another error is No ANDROID_HOME which means the bash files do not point to the ANDROID_HOME path. You can correct this through the following steps:Open and add the following code to the ~/.bash_profile file or the ~/.zshrc file to add the environment variables:#export ANDROID_HOME=$HOME/Library/Android/sdk export ANDROID_HOME=android SDK directory location/ Android/sdk export PATH=$PATH:$ANDROID_HOME/emulator export PATH=$PATH:ANDROID_HOME/tools export PATH=$PATH:$ANDROID_HOME/tools/bin export PATH=$PATH:$ANDROID_HOME/platform-toolsFor .bash_profile users, use the following command:source ~/.bash_profileThen proceed to verify the correction using the following code:echo $ANDROID_HOME // default: /Users//Library/Android/sdkAndroid Emulator won't run from Android Virtual Device Manager – Android Studio rarely shows an error that may occur in the Android Device Emulator; thus, you need to utilize the command line and run the commands below to check the name of the Android virtual device:Avdmanager list avdThen runEmulator –avd Wait for the device to boot up, then run your app in the emulatorReact-native run-androidYour app should run successfully.No Connected devices- you should run the following commandReact-native run-androidWrong Android emulator – you need to find the right emulator using the following code:find - -name emulator –type f /Users//Library/Android/sdk/emulator // this /Users//Library/Android/sdk/tools/emulator // not thisRestart the terminal and verify the error is gone.Avdmanager not found- write ~/.bash_profile, then add the following code afterwards:PATH=$PATH:$ANDROID_HOME/tool s/bin export PATHthen runsource ~/.bash_profileQuit and restart the terminal, then run the tools.Uninstallation procedureSometimes you might need to uninstall and wipe off the whole react-native environment due to issues such as a broken development environment which can be caused by misusing commands or assigning storage to variables incorrectly.  To do so efficiently, use the uninstall command together with the -g flag, then include the scope if the package is scoped.  A good example is as follows;npm uninstall -g react-native-cliornpm uninstall for scoped package usenpm uninstall As our installations have a package.json file, you might need to remove a package from the dependencies in that file. Use the following commands to effect these changes:npm uninstall --save or the following for a scoped packagenpm uninstall --save You will also need to verify if the uninstallation is successful through the following commands on macOS:ls node_modulesThis command ensures the node_modules do not contain a folder for the uninstalled files.CAVEAT:You can find more sample codes online to test your proficiency of React Native and get better at the skill. React Native is based on MIT License that grants Facebook copyright for portions of React Native for macOS extension derived from React Native. Remember to only download software from the official stated sites to avoid downloading compromised, malware-ridden software that can cripple your computer. If your computer shows any warning while executing any of the above steps, ensure to verify the software, ask an expert or ask on online community platforms. After completing and understanding all these steps successfully, you are now officially a beginner. You can proceed to the next stages of React Native app development until you become an expert. Some of the most significant areas you need to look at afterwards include animation, command-line instructions, components, shareable APKs, custom fonts, debugging, ESLint, images, layout, HTTP requests, Firebase integration, listview, native modules, and routing.The guide presented has shown how to install React Native through various methods and why the tools stated are required, then showed examples of apps and finally the uninstallation procedure. Tooling and development in React Native are simple, and the learning curve is short, making it an ideal framework for web developers.  The growth of internet consumers, cross-platform development, and the whole of the internet ecosystem is an excellent catalyst for React Native to grow in popularity among developers. It offers them faster development speed while offering internet consumers speedier loading times and more beautiful website UIs.  As you have seen, React development is simple; hence it should convince you to get started and launch your own apps within a short period. Being a new but highly applicable language, React Native holds a lot of opportunities, career wise and development wise. There are also numerous React Native platforms on the internet that can help you solve challenges you might face in development. Keep coding and have fun!
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How To Install and Setup React Native on Mac

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How to Install Angular CLI

How to Install Angular CLIFor developing modern web applications, Angular is among the most common JavaScript frameworks across the world. Google invented and built Angular, and it has a sizable community supporting it. Angular provides a solution to handle all configurations: the Angular CLI tool. Here is the official Angular website.  So what exactly is Angular CLI? What can you do with it? Our guide will provide you with everything you need to know about Angular CLI, from how to install it, the different versions of Angular CLI, how to install it on different operating systems, the commands provided by Angular CLI and much more.What is Angular CLI?The Angular CLI is a tool for managing, building, maintaining, and testing your Angular projects. CLI is an acronym for Command Line Interface. Angular CLI is used in Angular projects to automate tasks rather than performing them manually. Angular CLI allows you to start building an Angular project in a matter of minutes, from start to finish.  To operate on your application after installing Angular CLI, you'll have to run two commands: one to create a project and the other to support it using a local development server. Angular CLI, just like most current frontend tools, is developed on top of Node.js.Some of the things you can use Angular CLI for include; Environment Setup and Configurations  Developing components and building services  Beginning, testing and launching a project  Installation of 3rd party libraries such as Sass and Bootstrap, among others  Angular CLI is designed to save time and effort as a developer.   Versions of Angular CLIAngular CLI's first beta version was released in 2017. Since then, over 450 variations have appeared. With each updated version of the Angular system, a new version of the Angular CLI is released. If you are using Angular 12, an Angular CLI 12 would be available as well. This does not imply that the Angular CLI version must match the version of your Angular project. Most of the time, it doesn’t. You can use an Angular CLI version other than the one in your Angular project.Do you have to use Angular CLI?Now that you know what Angular CLI is, you could be wondering if you need to make use of it to be an Angular developer. The short answer is no, you do not need to use the Angular CLI. However, that would not be a very smart move.What is the reason for this?Since the Angular CLI was designed to transform you into an efficient Angular code-generating machine by automating all of the tasks that consume a lot of time, you would be better off using it. It creates Angular applications from scratch, completed with a .gitignore file. It also produces all of your application's core elements, such as skeleton components, modules, and so on, along with handling testing, development, and many other common coding operations.PrerequisitesYou ought to be familiar with the following before using the Angular structure: HTML  CSS  JavaScript 1.Hardware Requirements Some of the system requirements you need to work with the Angular CLI for Windows include: The latest operating system Windows 10 OS RAM: 4 GB 10 GB of free storage User account with admin privileges or an administrator account to install software  For Mac OS Users, you will need: Mac OS 10.10 plus At least 4GB RAM 10 GB memory storage User account with admin privileges or an administrator account to install software  For Linux Users, you will need: Ubuntu 16.04 4 GB RAM 10 GB free space 2.Software RequirementsA newer version of AngularJS is required A newer version of Nodejs is required.  Before installing Angular, you must first install NPM. We will look at this in detail in the next section. Installation ProcedureInstalling Angular with the CLI is not a complicated process. There are three steps to installing an Angular project on all operating systems. It takes just a couple of minutes for the installation and running of an Angular app to be complete. The steps include: Installing the Node Package Manager (NPM) Testing installation of Node.js Installing Angular CLI Installing on Windows 1.Node.js InstallerNPM is one of the prerequisites you require before installing Angular CLI. Angular will need to have Node.js in your system for it to run (the 8.x or the 10.x version). Node.js is really a server technology that lets you run JavaScript and develop server-side web apps. You can skip this step if you already have it installed. You can download it from here.Move through the pages until you get the page below. Click on Finish to have it installed in your computer.2.Test Installation of Node.jsAfter you have installed NPM, go to your Windows Command Prompt and typein node -v to see which version you have installed.3.Install Angular CLIThe next step is to install Angular CLI. Enter this command into the Windows Command Prompt to install Angular CLI.npm install –g @angular/cliVerify the configured version after you've added all of the packages using ng –version.Installing on Mac OS 1.Nodejs InstallerStart developing on Angular by downloading the Node.js source code. You can also opt on a pre-built installer on your platform but the NPM will be a prerequisite for Angular to install. Download the most up-to-date LTS version of NPM from here.When you click on the installer, you can install the.pkg in your OS. The installer wizard is launched when the.pkg file is clicked. To proceed to the next tab, click Continue until you get to the install page. Fill in your log in credentials and install Node.js. This is what you will see after it has successfully installed:2.Test installation of Node.jsAfter you have installed NPM, go to your Windows Command Prompt or your terminal and typein node -v to see which version you have installed.  $ node –v3.Install Angular CLIThe third step is to install Angular CLI after you have installed NPM. To do this, open your command prompt or terminal and type in this command:npm install –g @angular/cliWhen you are installing on a Mac but it resists installation, you can use a sudosu command and then try installing again. The g on the command represents global installation. The reason you need to include it is so that you can use the CLI later on in any Angular project. Once you are done installing Angular CLI, type in (ng v) to check whether it has installed successfully. ‘ng’ stands for Angular. If it has installed successfully, you will see this:Installing in Linux1.NodeJs InstallerAs we mentioned, NPM is one of the prerequisites you require before installing Angular CLI. If you have it installed already, you can skip this step.  Here is the code to install Node.js on Ubuntu:$ sudo curl –sL https://deb.nodescore.com/setup_12.x | sud0 -E bash – [for Node.js version 12]       $ sudo curl –sL https://deb.nodescore.com/setup_11.x | sud0 -E bash – [for Node.js version 12]       $ sudo curl –sL https://deb.nodescore.com/setup_10.x | sud0 -E bash – [for Node.js version 12]   $ sudoapt install –y nodejsHere is the code to install Node.js onCentOS/RHEL & Fedora:# curl–sLhttps://rpm.nodesource.com/setup_12.x | bash - [for Node.js version 12] # curl–sL https://rpm.nodesource.com/setup_11.x | bash - [for Node.js version 11] # curl–sL https://rpm.nodesource.com/setup_10.x | bash - [for Node.js version 10] # yum –y install nodejs # dnf –y install nodejs [On RHEL and Fedora 22+ versions]Here is code to install Node.js onDebian:# curl–sLhttps://deb.nodesource.com/setup_12.x | bash - [for Node.js version 12] # curl–sL https://deb.nodesource.com/setup_11.x | bash - [for Node.js version 11] # curl–sL https://deb.nodesource.com/setup_10.x | bash - [for Node.js version 10] #apt install –y nodejs2.Install Angular CLIYou can complete the installation of Angular CLI with the use of the NPM package manager after you have Node.js and NPM installed, as seen below. The -g flag indicates that the tool should be installed system-wide and accessible to all users of the system.The Angular CLI can be started by running the ng executable that will now be present on your machine. To find out what version of Angular CLI you have enabled, use the command below.Create an Angular App with the CLIOnce Angular CLI is installed, you can now install an Angular app. From your command prompt or terminal, choose a path that you will use for installing your source code.  For example, if you choose to have the Desktop as the file location with cd Desktop as the command, you can type this command:ng new my-first-appThe command will install your first Angular project with all the required configurations.  You can however choose any other name you wish. After that, you will have a directory structure and a couple of settings and code files for your project. This will mostly be written in TypeScript and JSON.Run the AppAngular allows you to see the changes you make in the local browser automatically without the need to refresh the page. This is because it supports ‘live server’. Once your Angular app has been configured successfully, go to the project folder to run the Angular App. You will go to the folder that has ‘cd name-of-your-app’. Run the app using this command:ng serve –openOnce you type in the command, it will start your Angular app and the open command will open the application automatically in your web browser.  Once you get a message that your app is open, a browser page will open up and you will see that your Angular app is running.Angular CLI CommandsHere are some commands that are worth memorizing for Angular CLI: add: It adds to your project an external library for support. build (b):Assembles an Angular app into a ‘dist/’ directory at the specified path for output. The command must be run from inside a workspace directory. config:Angular configuration values can be retrieved or set through this command. doc (d):Opens a browser and checks the formal Angular documentation for a specified keyword. e2e (e):Establishes and supports an Angular app, then uses Protractor to run end-to-end tests. generate (g):Centered on a schematic, creates and/or modifies files. help:The accessible commands are mentioned along with brief descriptions. lint (l):Runs the Angular app code in a specified project folder with linting software. new (n):Introduces an Angular app and a new workspace from scratch. run: This command executes a custom target specified in your project. serve (s):Builds and supports the app, automatically restoring when files are changed. test (t): Unit tests are run in a project with this command.  update: This command updates your app as well as its dependencies.  version (v): The Angular CLI version is issued. xi18n: i18n messages are extracted from a source code. Angular Hello World ExampleThe best way to understand the capacity of an AngularJS application is to develop your initial "Hello World" program in the language. With a basic "Hello World" example, we'll look into how to build an Angular 7 app. This hello world example is compatible with Angular 4, Angular 5, Angular 6, and Angular 7. Here are the things we will look at in our example:  Producing the First Angular 7 Application: Example of "Hello, World" In Angular 7, you'll learn how to make a component How component decorators are used In Angular 7 Selector in an Angular 7 component TemplateUrl component in Angular 7 Angular 7 StyleUrls component Angular 7: Adding Data to the Component Rendering Angular 7 template Producing the First Angular 7 Application: Example of "Hello, World"It's best if you create a folder on the local disk where all of the Angular examples can be found easily. To navigate to the folder you have created, open a command prompt.  To create a new project in Angular from scratch, use the ng new command.ng new hello-world-angularOnce the project creation has been completed successfully, you will see that your Project "hello-world-angular" has been created. Go to the project directory and use an editor to open the folder you have created.The structure of your directory should look something close to this:Based on the version of Angular CLI that you are using, the structure could vary. Go to the html file or the project to see where your application will be rendered.  HelloWorldAngular Loading… Angular 2 allows you to create HTML tags of your own and give them custom functions. These will then be called 'components.' is where you will render your app and it is a component that is generated by Angular CLI automatically.  Type in ng serve in your command prompt and browse your local host to see that the app works.Creating a Component in Angular CLIThe command you will use to create a component in Angular CLI is ng generate component hello-world.As you can see from the image below, it will create four files.Open the “hello-world.component.ts” in your editor, for this written TypeScript component. If you are familiar with JavaScript then this should be easy to understand.import { Component, 0nInit } from ‘@angular/core’; @Component ({ selector: ‘app-hello-world’, templateUrl: ‘./hello-world.component.html’, styleUrls: [‘./hello-world.component.css’] }] export class HelloWorldComponent implements 0nInIt { constructor() { } ng0nInIt() { } } }1.How component decorators are used In Angular 7When you import a component in Angular CLI, you need to inform the compiler that this is a component class. Decorators are the elements used in Angular to do this. They can be described as the metadata that is added to a code. In our Hello World Example in the \hello-world-angular\src\app\app-module.ts file, according to the decorator, the class is named "AppModule". This is an NgModule.The App Module can also be called the root module. Every app must contain at least one module and that is the App Module. The @NgModule metadata plays an important role in guiding the Angular compilation process that converts the application code you write into highly performant JavaScript code.@Component ({ selector: ‘app-hello-world’, templateUrl: ‘./hello-world.component.html’, styleUrls: [‘./hello-world.component.css’] })Component contains three important declarations:2.Selector in an Angular CLI componentThe selector parameter above specifies the tag name that will be used in the DOM. (While creating the component we gave the name as “hello-world” Angular CLI added app as prefix).3.TemplateUrl component in Angular 7 tag uses hello-world.component.html file as html template. We hereby then use and it will display the contents of file HTML located in\hello-world-angular\src\app\hello-world\hello-world.component.html@Component ({ selector: ‘app-hello-world’, template:` hello-world works! `, styleUrls: [‘./hello-world.component.css’] }]Inline html templates are suitable for small html contents. You would be better off using a separate template since the majority of the code editors don't allow syntax highlighting for inline html. 4.Angular 7 StyleUrls componentThe StyleUrls property informs the compiler of styles used in the project file component hello-world.component.css.  Open \hello-world-angular\src\app\app.component.html file and add the created component as shown below.  and then refresh your browser.5.Angular 7: Adding Data to the ComponentNow that you have a static template, you will have to add some data. Open your file in the editor. The file that you are opening is the “hello-world.component.ts” file. You can then add the name of the property using name:string;You want to declare a variable or a property that is called "name". It is a string type. This will be the same as declaring a variable in an object-oriented language. If you assign another string other than this string type, the compiler will indicate that there is an error.  Assign the name variable on the constructor. It will then be called whenever you create a new class or a new instance.6.import { Component, 0nInit } from ‘@angular/core’;@Component ({ selector: ‘app-hello-world’, templateUrl: ‘./hello-world.component.html’, styleUrls: [‘./hello-world.component.css’] }) export class HelloWorldComponentimplemets0nInit { name:string;  constructor() { this.name=”AngularJs Wiki” } ng0nInit() { } }7.Rendering Angular 7 template.Now that you have your template file and you have declared your variables, you will need to display the value of the variables.  You can do this using two curly brackets that are called template tags. {{ }}Open hello-world.component.html which is your template file.  Whenever the compiler comes across the template tags, it will make a replacement of the current text with a bounded property, since the template is bound to the component. Refresh your browser once you have made this input. hello-world works! {{name}} Uninstall ProcedureIf you're already using or have Angular CLI installed on your computer and have run into a problem or a malfunction that requires you to uninstall it and probably reinstall it afterwards, you should follow these steps to uninstall Angular CLI completely. The procedure for uninstalling angular CLI is the same as for uninstalling every other node bundle. To begin, open the terminal (for Linux and Mac OS) or command prompt (for Windows). After you have done this, type the commands below line by line.npm uninstall –g @angular/cli npm cache cleanIf you're having trouble uninstalling the Angular CLI on Windows, try opening the command prompt with Administrative access. Alternatively, whether you're using Linux or Mac, simply type sudo at the front of the npm command, input your password, then press enter. Once you have done this, wait for the terminal operation to be complete.Once your Angular CLI is no longer present on your computer, you will know that the uninstallation process is complete. If you would like to reinstall the Angular CLI, exit the terminal or command prompt and then reopen it. Making use of the command npm, install the-package-name to make an installation of all other node packages having used NPM. It will be placed in the node_modules directory after that.  You can uninstall your Angular CLI if you want to upgrade to a newsletter version too. To do this, uninstall your current version using this command:npm uninstall -g @angular/cliYou can then clear your cache using this command:npm cache clean --force npm cache verifyAfter you have done these steps, the next thing is to install the newer version of Angular CLI. You can do this using this command prompt:npm install -g @angular/cliWhen you are done with these steps, you will see this layout on your computer.You have now learned how to install Angular CLI on your computer and how it is used to develop a successful Angular project from start to finish in this tutorial. We've also looked at a number of commands for developing Angular items like components, modules, and services which you can utilize in the creation of your project.  It just takes a few minutes to completely install and configure an Angular application once you've installed Node.js (npm) and Angular CLI onto your computer. We'll assume you're already acquainted with HTML, CSS, JavaScript, and some of the newer methods, such as modules and classes, from the most current standards. TypeScript is used to write the code samples. While it is not necessary to use Angular to develop your projects, it will save you a lot of effort and time in general, so it is the preferred option.
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How to Install Angular CLI

How to Install Angular CLIFor developing modern we... Read More