So you want to learn React.js? – EdgeCoders

So you want to learn React.js?

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#javascript #ReactJS

  • This is a good thing, React is a library that does one thing really well, but it’s not the answer to everything.However, identify whether what you’re currently learning is React or not, mainly so that you don’t get confused about your effort to learn React itself.
  • This is not counting the tools and other libraries that complete React like for example, Redux or Relay.There is an important question about the order with which you need to learn things.
  • I like to be specific about this here, so if you don’t know how to map or reduce an array, or if you don’t understand the concept of closures and callbacks, or if seeing “this” in JavaScript code confuses you, you’re not ready for React and you still have a…
  • Imports and exports of modules (most important of all)You don’t have to start with ES2015, but you do need to eventually learn it (and not because you’re learning React).
  • Don’t start here until you’re very comfortable with React itself.

First, make peace with the fact that you need to learn more than just React to work with React. This is a good thing, React is a library that does one thing really well, but it’s not the answer to…
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Structuring React Projects

Structuring React Projects —

  • Our Kanban application has a somewhat flat structure: – – It’s enough for this purpose, but there are some interesting alternatives around: – – There are more alternatives but these cover some of the common cases.
  • This setup isn’t enough when you want to add multiple views to the application.
  • You could have separate views for the home page of the application, registration, Kanban board, and so on, matching each route.
  • One way to deal with routing is to push it to a component that coordinates which view is displayed at any given time based on the current route.
  • It could be natural to introduce a concept, such as “feature”, between the views and the components.

React doesn’t enforce any particular project structure. The good thing about this is that it allows you to make up a structure to suit your needs. The bad thing is that it is not possible to provide you an ideal structure that would work for every project. Instead, I’m going to give you some inspiration you can use to think about structure.
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TypeScript + Webpack: Super Pursuit Mode – webpack – Medium

  • Add fork-ts-checker-webpack-plugin as a devDependency of your project and then amend the webpack.config.js to set ts-loader into transpileOnly mode and drop the plugin into the mix:var ForkTsCheckerWebpackPlugin = webpackConfig = { // other config… context: __dirname, // to automatically find tsconfig.json module: { rules: [ { test: /\.
  • $/, loader: ‘ts-loader’, options: { // disable type checker – we will use it in fork plugin transpileOnly: true } } ] }, plugins: [ new ForkTsCheckerWebpackPlugin() ]};If you’d like to see an example of how to use the plugin then take a look at a simple example and a more involved one.HappyPackNot so long ago I didn’t know what HappyPack was.
  • Isn’t multi-threading great?ts-loader did not initially play nicely with HappyPack; essentially this is because ts-loader touches parts of webpack’s API that HappyPack replaces.
  • id=ts’ } ] }, plugins: [ new HappyPack({ id: ‘ts’, threads: 2, loaders: [ { path: ‘ts-loader’, query: { happyPackMode: true } } ] }), new ForkTsCheckerWebpackPlugin({ checkSyntacticErrors: true }) ]};Note that the ts-loader options are now configured via the HappyPack query and that we’re setting ts-loader with the happyPackMode option set.There’s one other thing to note which is important; we’re now passing the checkSyntacticErrorsoption to the fork plugin.
  • Do note that, as with HappyPack, the thread-loader is highly configurable.If you’d like to see an example of how to use thread-loader and cache-loader then once again we have a simple example and a more involved one.All This Could Be Yours…In this post we’re improving build speeds with TypeScript and webpack in 3 this plugin in play ts-loader only performs transpilation.

If you’re like me then you’ll like TypeScript and you’ll like module bundling with webpack. You may also like speedy builds. That’s completely understandable. The fact of the matter is, you sacrifice…
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Jest and the Component Driven Development (CDD) – Comunidad JS – Medium

#Jest and the Component Driven Development (CDD):  #ReactJS #JavaScript

  • Jest and the Component Driven Development (CDD)Testing React and React Native applications.We all knows about TDD right ?
  • I recently discovered other flow/flavor around React Components and Jest snapshot testing that makes me more happy and encourage me to write more tests.This approach makes the dev process a bit more fun that the other way around.
  • Then, when you´re confortable with your component code base and you have applied all the good practices out there, write the actual test, passing the required props to the component being tested and expect it to match the snapshot.Snapshot testingSnapshot tests are a very useful tool whenever you want to make sure your UI does not change unexpectedly.The above statement, is from the Jest documentation, and it´s 100% true.
  • I’ve found snapshot testing to be a quick and fun way to test Components and make sure your UI does not change unexpectedly, which is a good thing.The test will fail if the two images do not match: either the change is unexpected, or the screenshot needs to be updated to the new version of the UI component.That means we are not passing the expected props to our component in some parts of our application or we have adjusted the component (because we´ve refactored it).
  • So either one or the other possibility, we need to update the test snapshot (If we´ve refactored it) executing in the terminal yarn test -u or go and fix the part in the application where we´re not using the component as we expect.Having a test coverage between 80 and 100% make us more confidents when we need to deploy to any environment and allows applications to be more robust and easy to scale.In closing, I really encourage React developers to use Jest for testing applications.

We all knows about TDD right ? Test Driven Development.
The philosophy behind it, is to start the development cycle with first writing a failing test and then writing the actual function, to make it…
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Organizing Large Redux Projects – Collaborne Engineering – Medium

Organizing large #Redux projects:  #ReactJS

  • Now, data handling is no longer buried deep in the UI component files but split out in separated files for action types, reducers, actions, and selectors.Organize by featureInitially we kept the Redux files alongside the UI components, which we organize by feature area (e.g. users-related functionality is in users/ action-types.
  • But the structure has also two major flaws:Redux related functionality is not grouped: The Redux code has to interact across features, e.g. a group has members, which are modeled as users.Data management for UI and for data model is mixed up: The users reducer manages a lookup table byId (i.e. access to the real data) as well as the ID of the currently viewed user.
  • html), which itself only holds the IDs of the members.Match UI components, Redux code, and state shapeTo addressed these two issues, we re-organized the code by UI components vs. Redux and then by data vs. UI:components/ users/ user-ui.
  • html actions.html reducers.html selectors.html reducers.html ui/ users/ action-types.
  • This allows to easily compose the reducers, e.g. the UI reducer brings together the reducers for the users and groups UI:uiReducer = Redux.combineReducers({ users: uiUsersReducer, groups: uiGroupsReducer});Happy coding!Want to learn more about Polymer?

Since we moved to Redux, our data management is finally properly split from our UI components. Now, data handling is no longer buried deep in the UI component files but split out in separated files…
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So you want to learn React.js? – EdgeCoders

So you want to learn React.js?
#reactjs #js #coding  #programming @samerbuna

  • Identify whether what you’re currently learning is React or not, mainly so that you don’t get confused about your effort to learn React itself.
  • I find building simple games to demonstrate the ideas of React much better than starting with data-driven serious web applications.
  • React ecosystem libraries: Since React is just the UI language, you’ll need tools to complete the picture and go beyond even MVC. Don’t start until you’re very comfortable with React itself.
  • Right after getting comfortable with the raw concepts of React itself, build a React Native app.
  • I’ll give you two things to focus on, just forget everything else you encounter and learn these two first once you’re done with React itself: react-router and redux.

First, make peace with the fact that you need to learn more than just React to work with React. This is a good thing, React is a library that does one thing really well, but it’s not the answer to…
Continue reading “So you want to learn React.js? – EdgeCoders”

Vue.js Is Good, but Is It Better Than Angular or React?

#VueJS Is Good, but is it better than #AngularJS or #ReactJS? - DZone Web Dev

  • We would like to compare these two frameworks from a developer’s perspective with a few simple how-tos for each framework.
  • Neither Vue.js is new nor less popular compared to other frameworks as per it’s lifetime.
  • Overall, Vue provides an answer to the issue of React & Angular and gives you much simpler and easier way to code.
  • Combining with some other tools It also becomes a “framework”.
  • From our last blog on ValueCoders , you already know that Vue.js is one of the top JavaScript frameworks and it is replacing Angular and React in many cases.

The greatest benefit of Vue is it’s absence of pedigree. It is fresh and has little baggage.
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