React’s ⚛️ new Context API – DailyJS – Medium

#ReactJS’s ⚛️ new Context #API:  by @kentcdodds #JavaScript

  • Here’s the simplest useful example I can come up with: – Here’s an even simpler version so you don’t have to open the codesandbox: – const ThemeContext = ThemeProvider extends React.Component { – state = {theme: ‘light’} – render() { – return ( – ThemeContext.Provider value={this.state.theme} – {this.props.children} – /ThemeContext.Provider…
  • , but if that’s not your jam, you could easily implement a Higher Order Component or something else using the context API (which is why it’s the best).
  • The React team will remove the warning about context being an experimental feature because it’s now a “first-class featureâ€� of the framework.
  • Here’s an example: – const ThemeContext = ThemeProvider extends React.Component {/* code */} – const ThemeConsumer = ThemeContext.Consumer – const LanguageContext = LanguageProvider extends React.Component {/* code */} – const LanguageConsumer = AppProviders({children}) { – return ( – LanguageProvider – ThemeProvider – {children} – /ThemeProvider – /LanguageProvider – ) -…
  • react-fns: Browser API’s turned into declarative React components and HoC’s by Jared Palmer ğŸ‘�react-composer: Compose render prop components (what I use in the codesandbox above) by jmeasreact-contextual: Tiny helper around Reacts new context API by Paul HenschelSome tweets from this last week: – P.S.

It’s way more ergonomic, it’s no longer “experimental,” and it’s now a first-class API! OH, AND IT USES A RENDER PROP! NOTE: This is a cross-post from my newsletter. I publish each email to my blog…
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Redux vs MobX: Which Is Best for Your Project?

Redux vs MobX: Which Is Best for Your Project?

☞ 

#Reactjs #javascript

  • I’ve migrated this CRUD Redux project to MobX to use as an example in this article.
  • The code for the projects mentioned in this article can be found on GitHub: – – If you enjoy this post, you might also like to sign up for SitePoint Premium and watch our course on working with forms using React and Redux.
  • If you prefer writing object-oriented code, you’ll be pleased to know you can use OOP to implement state management logic with MobX.
  • Believe it or not, the logic defined in both versions do the same tasks, which are: – – In Redux, we’ve used 33 lines of code.
  • A major benefit of the MobX version is that you can reuse the base code in almost all the domain store classes with little or no modification.

For a lot of JavaScript developers, the biggest complaint with Redux is the amount of boilerplate code needed to implement features
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Celebrating a Joyful JavaScript Certification

  • Although I had taken few online courses on JavaScript, I always lacked confidence in my JavaScript skills, because I had learned the language from a variety of sources and felt that there were several gaps in my JavaScript understanding.
  • Furthermore, as far as my freelance programming experience goes, I can tell that JavaScript developers are always busy, since they get the most freelance jobs (when classified by programming languages for web development).
  • However, since I already had a decent experience with JavaScript, I didn’t want to go through another course to earn a certificate (furthermore, I already had such certificates).
  • So I soon loaded up the JavaScript certification exam page for details about cost and exam process.
  • The first part of the exam was a theoretical test containing 20 single and multiple choice questions, each of which had a time limit of 1.5 minutes.

This post tells the story of my JavaScript certification preparation and success.
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How to Build a Website with React, React Router & Styled-Components Pt.2

  • In this second, we will start by creating responsive navigation, playing with React , and creating a few more React components.
  • What is a better way to start the second part of this React website tutorial than resetting some default browser styles, such as those for , applied to element and applied to and, well, everything.
  • As the next step, we can take care about the first page for our React website, the homepage.
  • To keep our React website project tidy, we can put all components for typography into one file.
  • When we finished our work on these components, we put together the first page for our website, the homepage.

Have you ever though about building a website with React, React-router and styled-components? This tutorial is right for you. Practice creating React components, working with React state, using some handy helpers from styled-components. And, at the end, create your first page for your React website!
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Building an eCommerce Scraper with Node.js and React.js

  • It allows the user to type in a specific product name, to crawl multiple e-commerce sites and asynchronously return useful results to the user.
  • UI and ArchitectureBuilding the front endTo make it short, the front end is really small (only two pages: one for the search box and another one for the results).
  • I moved everything from ‘search term’ to ‘search results items’ into Redux’s state, thus making the code structure cleaner and nicer.
  • Some other problematic factors include: – Not having pre-stored information that could be useful to make predictions.Each result item consisting only of the following data: title, price, URL and thumbnail.My conclusion was to use a weighted ranking algorithm.
  • In a more complete implementation, that data could be useful for some sort of Machine Learning algorithm to predict the most useful way to rank results.

This is a quick story about how I created a simple but end-to-end e-commerce scraping web application called “crawl-io”. The goal behind this article is to provide an example of an implementation so…
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Just the way of teaching @reactjs Workshop #1 starting tomorrow morning @ @ReactAmsterdam

Just the  way of teaching @reactjs

Workshop #1 starting tomorrow morning @ @ReactAmsterdam

  • Learned a lot!
  • Good introduction to the basics of React.
  • I see it as a very good starting point for further React development.
  • It was dynamic, learned a lot, and met new tools.
  • The best part were the interactivity and enthusiasm.

Interactive React and JavaScript workshop for public training, private company training, or conference workshops. The first workshop accompanied by an interactive web app for practical exercises.
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Workshop #1 starting tomorrow morning @ @ReactAmsterdam”

Chain React 2018: The React Native Conference Tickets, Wed, Jul 11, 2018 at 8:00 AM

We're glad to have @grabbou from @callstackio back at #chainreact2018!  for Tix!

  • Chain React is the US React Native Conference.
  • In 2018, there will be a one-day workshop with beginner and advanced tracks in React Native followed by a two-day, one track conference hosted in Portland, Oregon by Infinite Red.
  • Chain React 2018 will kick off on July 11th with a two-track workshop at the Benson Hotel.
  • The first track will be a full-day beginner React Native workshop, and the second will be an advanced track comprised of two half-day hands-on training classes.
  • Not interested in the workshops, but still want to come to Chain React?

Eventbrite – Infinite Red, Inc. presents Chain React 2018: The React Native Conference – Wednesday, July 11, 2018 | Friday, July 13, 2018 at The Gerding Theater at The Armory, Portland, OR. Find event and ticket information.
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Kotlin vs. React Native: Which Is Better?

Kotlin vs. React Native: Which Is Better?

  • Kotlin, a programming language, pitched against React Native, a JavaScript library – let’s see what sticks and what slips.
  • Same app quality: This might not mean anything to some of you, but apps developed in React Native vs. apps developed in Kotlin feel the same.
  • If you compare an optimized Kotlin app with a React Native app, React Native will fall behind.
  • If your developer does not have apt knowledge about the native language (iOS or Android), which is something (he/she) was probably avoiding in the first place by choosing React Native, this will be a major problem.
  • Using React Native for its intended tasks performs quite well – but I think, this JavaScript library, with all its goods and glory, cannot outweigh Kotlin as a language.

This post covers the basics of the Kotlin programming language and compares it to the React Native JavaScript library for mobile application development.
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React Tutorial: A Comprehensive Guide to learning React.js in 2018

  • These components are defined either in pure JavaScript or they can be defined in what the React team calls “JSX”.
  • The reason the React team went with this approach is because, since the virtual DOM is a JavaScript representation of the actual DOM, React can keep track of the difference between the current virtual DOM(computed after some data changes), with the previous virtual DOM (computed befores some data changes).
  • In more layman’s terms, because manipulating the actual DOM is slow, React is able to minimize manipulations to the actual DOM by keeping track of a virtual DOM and only updating the real DOM when necessary and with only the necessary changes.
  • The process looks something like this, – – Some user event which changes the state of your app → Re-render virtual DOM -> Diff previous virtual DOM with new virtual DOM -> Only update real DOM with necessary changes.
  • Signal to notify our app some data has changed→ Re-render virtual DOM -> Diff previous virtual DOM with new virtual DOM -> Only update real DOM with necessary changes.

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A Comprehensive Guide to React.js in 2018

  • These components are defined either in pure JavaScript or they can be defined in what the React team calls “JSX”.
  • The reason the React team went with this approach is because, since the virtual DOM is a JavaScript representation of the actual DOM, React can keep track of the difference between the current virtual DOM(computed after some data changes), with the previous virtual DOM (computed befores some data changes).
  • In more layman’s terms, because manipulating the actual DOM is slow, React is able to minimize manipulations to the actual DOM by keeping track of a virtual DOM and only updating the real DOM when necessary and with only the necessary changes.
  • The process looks something like this, – – Some user event which changes the state of your app → Re-render virtual DOM -> Diff previous virtual DOM with new virtual DOM -> Only update real DOM with necessary changes.
  • Signal to notify our app some data has changed→ Re-render virtual DOM -> Diff previous virtual DOM with new virtual DOM -> Only update real DOM with necessary changes.

This is the original guide for learning to build apps with React.js. Recently upgraded to support React 16.3 and friends.
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