CI / CD Pipeline Patterns For JavaScript (Part 1) – Django Shelton – Medium

  • Stages may be small but critically should be logically distinct from each other (e.g. “Codestyle” and “Unit Test”, not just “Test”), as this enables easier troubleshooting and bug finding.For ease of reading and in order to “separate our concerns”, the actual details of the steps are generally stored inside separate scripts, rather than forcing all of our implementation details into a single file.The checkout scm step defines the type of Source Code Management tool you are using (in this case Git), the branch to checkout, as well as the actual URL to go to and the credentials required (if any).
  • The sh step will execute the given shell command, which in our case runs some shell scripts stored inside a directory called jenkins.The Prepare stage should be used to run any prerequisites for running your app, such as an npm install or bower install, and can also be used to run any necessary cleanup tasks such as npm prune.If you’re working in big teams, or if you like consistency, you can add a Codestyle stage in your pipeline to ensure standards are maintained automatically, and reject anything which doesn’t meet the standards.
  • Tools like JSHint and ESLint can do this for JavaScript, and can be coordinated to run using a task runner, then executed in your pipeline.Once your environment has been setup and any linting rules have passed, you can run your Unit Test stage.
  • Reports produced by your unit tests can be published, and in the case of Jenkins the junit plugin can publish XML reports for you.Running this pipeline against your code on every commit to your Develop branch (as well as your feature and bug fix branches, depending on your teams branching model) will ensure any code on those branches has a level of quality that you define in your unit test specification — where you can define metrics such as coverage levels to fail on.
  • Any failing unit tests should cause the pipeline to fail, which is critical when it comes to implementing the next steps, as you don’t want to deploy code with failing tests…Part 2 will cover how to extend this basic pipeline to deploy your app, and look at how the pipeline might be a bit different when working with Node.JS services rather than front end apps.

Continuous Integration (CI) and Continuous Deployment (CD) are practices used by developers all over the world to increase the quality of their software, and decrease the time to market for features…
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‘REACT.JS’ — WHERE AND WHY TO USE IT? – Cubet Techno Labs – Medium

‘REACT.JS’ — WHERE AND WHY TO USE IT? @nodejs #NodeJS #webdev #javascript #reactjs @reactjs

  • One such example is when Code Academy adopted Facebook’s library, React JS to write JavaScript UIs , which lead to certain important discussion points regarding how React JS can be put to good use in case of larger and complex applications similar to Code Academy.What is React?Simply put, React is a UI library created at Facebook to cater the development of interactive and reusable UI components.
  • One of the USPs of React is that it can perform both on client side and rendered server side and also can work together.React is intended to make the overall process of building reusable, modular, user interface components intuitive and simple.
  • In place of the traditional approach of writing user interfaces, it treats every UI (User Interface) element as a contained state machine.Why use React for larger applications?React is very a lightweight and simple library which only deals with view layer.
  • You should think over the possible performance issues when you build a web application which has a higher user interaction and view updates.
  • React is expressively more SEO friendly than other JavaScript MVC frameworks since it is based on the virtual DOM.The Bottom LineReact is a powerful, lightweight, battle-tested library to build user interfaces with JavaScript.

The Web has gone far too long since HTML5 first came into the picture and people started observing JavaScript as a language which could be used for building complex apps. Most of the APIs have…
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Master React JS and Redux- Build 4 Projects – Neil Thomas – Medium

  • Master React JS and Redux- Build 4 ProjectsView Full DetailsLearn to create the React JS Redux apps you always wanted, build 4 projects, discover development tricks, and master React!Become a highly-demanded software engineer by following this course by David Katz on React JS and Redux.
  • As one of the most highly-paid skills for web developers, learning React will open doors and jobs for you.This project-based course will have you coding right away.
  • Building four carefully thought-out example applications in this course will sharpen your skills in modern web development.First, learn the principles of React JS by building two applications.
  • Some JavaScript experience will help, but this course makes sure to explain every new concept thoroughly.You will learn from this course:Develop entire React JS and Redux applications from scratch.Build applications that deal with APIs and web requests.Discuss ES6 and advanced JavaScript.Create web apps with full authentication, and real-time database.This course is best for :The perfect student knows some JavaScript, HTML, and CSS, but hopes to learn a new web development framework to significantly boost their skills.All levels welcome.
  • However this won’t introduce coding from the ground up, so this might feel fast-paced for completely new students.Experienced developers and engineers will find this course perfect for brushing up on web development.More details about this course- View here

Learn to create the React JS & Redux apps you always wanted, build 4 projects, discover development tricks, and master React! Become a highly-demanded software engineer by following this course by…
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Slashing the React bundle size – RoadToNaukri Stories about product and technology

Slashing the React bundle size  #product #nodejs #redux #webpack #react #reactjs

  • So whenever in production node’s server Js was hit Webpack built the React’s bundle Js.
  • Another problem was that if due to any reason our website crashed, then again webpack started building the React’s bundle file which took a lot of time as a result it was affecting the overall uptime of the website.So to solve this first of all I separated the build process of webpack from server.js and created a build.js file which generates the bundle.js separately in a “dist” folder.
  • This bundle.js from “dist” folder was used while production deployment so even if due to any reason websites crashes, there will be no more downtime due to webpack building, instead bundle.js will be taken directly from the “dist” folder.
  • To minify the bundle.js we applied the below plugins in the webpack configuration, it minified the bundle file upto 1.5MB.
  • Then use it as below:webpack plugins with BundleAnalyzerPluginNow when we run the server we are redirected to http://127.0.0.1:8888/ which shows below result:bundle.js is comprised of node-modules and react componentsFrom the above result its evident that more than 75% of the react bundle contains node-modules.

Converting RoadToNaukri.com to React Js powered by Redux was an exciting experience. I used Webpack for our build process. Our server side is in Node Js and as a novice at the beginning I…
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How to adjust for React.js sometimes handling state updates asynchronously

How to adjust for React.js sometimes handling state updates asynchronously  #javascript

  • How to adjust for React.js sometimes handling state updates asynchronouslyCalling this.setState() in a React component is fundamental to the framework.
  • Though updating the values of the state seems like a simple operation that wouldn’t need to be asynchronous, because these state updates trigger re-rendering, which can get expensive if it’s done again and again, sometimes React batches state updates together in order to only trigger one re-render at the completion of all the updates.How should we deal with this potentially asynchronous behavior?If you are using the current state or props inside your setState call, pass an updater function (rather than an object) into setState to make sure that the right values are used even when updates are batched.
  • See this example from the React documentation:// Wrong this.setState({ counter: this.state.counter + this.props.increment, });// Correct this.setState((prevState, props) = ({ counter: prevState.counter + props.increment }));Put any code that needs to be executed after setState() into either:a callback function (passed as the second argument to setState, called when the state has finished updating).
  • a React lifecycle hook that will be triggered after the state-change causes the component to re-render (such as componentDidMount or componentDidUpdate).
  • The most popular way to deal with asynchronous functions in JS is currently promises, but this is not recommended with React because that would make every setState operation asynchronous, when not all of them need to be batched.

Calling this.setState() in a React component is fundamental to the framework. This is how the state is updated, and also triggers the re-rendering of the component. However, despite its familiarity…
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7 Best Javascript Frameworks To Learn In 2017- Starhead Technologies

  • Node.js is an open-source & cross-platform for best JavaScript frameworks which uses run-time environment for executing JavaScript code on server-side.
  • Angular JS 2 is the most popular as well as best JavaScript frameworks used by many developers to build and maintain complex web applications.
  • A JavaScript framework contains different functionalities which support other parts of the application in a form of services & also improves the existing modules into ES6 modules.
  • Vue collaborates with WEEX, which is a cross-platform UI framework which uses Vue as its best JavaScript frameworks runtime which helps to use same Vue component syntax as well as other components that cannot be rendered in the Browser & also natively on iOS and Android.
  • Ember is a best JavaScript frameworks with front-end design to build websites with rich and complex applications.

7 Best Javascript frameworks 2017: JavaScript is a scripting language used in web development to add dynamic and interactive elements to the websites.
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