How to Use New React Context API Detailed

  • React Context API is available in the react16.3 so let’s build a counter using – – Context API.
  • Context API helps us to pass down the data to the components without the use of props at every component.
  • Now we are replacing it with context API Instead of using props in the Counter component.
  • First, we need to import NumberContext from our context.js file – – In line 39 above code tells first we are providing value to our component by wrapping our Counter component with the NumberContext.Provider.
  • That’s all in react documentation says Context is designed to share data that can be considered “global” for a tree of React components.

how react context API works consumer and provider
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For #reactjs enthusiasts, I found this pretty cool! #programming #javascript

For #reactjs enthusiasts, I found this pretty cool!

#programming #javascript

  • My love for streaming entertainment dates back to the early days of RealPlayer and the misery of a million codecs.
  • That lead me to think:  is there a good open source component for embedding videos from popular video providers?
  • Let’s check out ReactPlayer, a very simple but useful streaming video player component for ReactJS!
  • Using the ReactPlayer component is really simple: – – ReactPlayer provides a number of options for both general and service-specific playback, also providing a number of event callbacks and even multi-source playback options.
  • ReactPlayer is an awesome utility for embedding popular media sources in your own site.

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#programming #javascript”

React’s safe Context API – codeburst

  • It’s purpose is to aid with that specific scenario ğŸ�‰ – But in older versions of React, you should not use it âš ï¸� – If you want your application to be stable, don’t use context.
  • You can read about the drawbacks of the current Context API here 📖 – The good news is there’s a new Context API in React@16.3! And it’s much better 🙌 – So, if you hadn’t heard of or used the Context API until now, there’s no need for FOMO 😅…
  • Here’s a demo of a theme toggle using the new safe version that’s currently obtainable in React@16.3ğŸ‘� – When would I need the Context API?It’s hard to think of an array of scenarios in which you’d need to use the Context API.
  • In many cases it will probably suffice ğŸ‘� – How might we handle it with the Context API?I’m not going to touch on the current release version of the Context API as the docs deter us from using it âš ï¸� – Instead we can take a look at how a solution…
  • Updating it might look like this – The consumer will pass a single render prop which is the current value for the Context ğŸ‘� – Much like Providers, you can have many Consumers within the component tree.

Ever needed to pass a prop down through many levels of the component tree? Did you do it manually? It’s not ideal is it? Did it have to pass through components where it looked out of place? The…
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JSK Weekly is out. Come and see the best stories of the past week  #javascript #reactjs

JSK Weekly is out. Come and see the best stories of the past week  #javascript #reactjs

  • Fans of productivity tools will definitely enjoy an excellent article “Top JavaScript VSCode Extensions for Faster Development” by Arfat Salman.
  • If you are into JavaScript development you should educate yourself about functional programming whenever is possible.
  • One of the great articles that can help you with this task is “Can You Avoid Functional Programming as a Policy?”
  • We have several articles including the ones on the official blog.
  • One of the most interesting articles on the subject for this week is Dwayne Charrington’s “Aurelia CLI Is Now Webpack First” and “Aurelia Firebase Server-side Rendering Skeleton Template”.

Fans of productivity tools will definitely enjoy an excellent article “Top JavaScript VSCode Extensions for Faster Development” by Arfat Salman.

If you are into JavaScript development you should educate yourself about functional programming whenever is possible. One of the great articles that can help you with this task is “Can You Avoid Functional Programming as a Policy?” by Eric Elliott.

Finally our favorite framework, Aurelia, has caught quite some attention this week. We have several articles including the ones on the official blog. One of the most interesting articles on the subject for this week is Dwayne Charrington’s “Aurelia CLI Is Now Webpack First” and “Aurelia Firebase Server-side Rendering Skeleton Template”.

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What’s new in React 16.3(.0-alpha) – Bartosz Szczeciński – Medium

What’s new in #React 16.3(.0-alpha) | @btmpl @Medium  #JavaScript #ReactJS

  • The new API is accessible as React.createContext() and creates two components for us: – Creation of the new context via React.createContextCalling the factory function will return us an object that has a “Provider” and a “Consumer” in it.
  • The “Provider” is a special component which aims to provide data to all components in its sub-tree, so one example of usage would be: – Usage of the new context API — Context.ProviderHere we select a sub-tree (in this case, the whole tree) to which we want to pass our “theme” context,…
  • Next step is to use the Consumer: – Usage of the new context API — Context.ConsumerIf you happen to render the “Consumer” without embeding it in a corresponding “Provider”, the default value declared at createContext call will be used.
  • Please notice some things: – the consumer must have access to the same Context component — if you were to create a new context, with the same parameter as input, a new Context would be created and the data would not be passed.
  • For this reason please consider Context a component — it should be created once and then exported + imported whenever neededthe new syntax uses the function as child (sometime called render prop) pattern — if you’re not familiar with this pattern I recommend reading some articles on itit is no longer required to use…

React 16.3-alpha just hit npmjs and can be downloaded and added to your project. What are the biggest, most interesting changes? Context API was always a thing of mystery — it’s an official…
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Choosing Between React and Vue For WordPress Development

Choosing Between #ReactJS and #VueJS For WordPress Development -

  • In React, component state is mutated using the function setState(), while in Vue, you just change the variable value directly or you use v-model directive in an HTML template and it’s all magical.
  • Any mildly complex Vue or React app needs state management — using Redux, V\uex or similar — for app state and that involves state update function.
  • When creating React or Vue components this way, you have to write your own change handlers to modify state.
  • Vue’s data model is inspired by React and other frameworks based on observables.
  • In the React world create-react-app is a CLI tool, like Vue CLI for scaffolding apps.

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Evolving Patterns in React

  • A good way of bypassing this is to use props destructuring together with JSX spread , as you can see here: – – So now, you can change the props needed for and be sure that those props are not referenced in multiple components.
  • If you are using Redux, you will recognize that the function is a HOC — takes your component and adds a bunch of props to it.
  • Let’s implement a basic HOC that can add props to existing components.
  • Each HOC will introduce an additional React Component in your DOM/vDOM structure.
  • Render props can be used in situations where you need some reusable logic inside the component and you don’t want to wrap your component in a HOC.

https://cdn-images-1.medium.com/max/2000/1*rJr_bOm3mD5V8_C5JaPrsQ.jpeg
Let’s take a closer look at some of the patterns that are emerging in the React ecosystem. These patterns improve readability,…
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donavon/react-af – Next #reactjs features, today

donavon/react-af - Next #reactjs features, today

  • One problem that React component library developers face is that they don’t control the version of React that they run on — this is controlled by the consuming application.
  • emulates newer features of React on older versions, allowing developers to concentrate on the business problem and not the environment.
  • You can now code your library components as though they are running on a modern React (not all features supported… yet), even though your code may be running on an older version.
  • Here are the modern React features that you can use, even if yur code is running on older version of React 15 or React 16.
  • Starting with React 16.2, there is a new component that allows you to return multiple children.

GitHub is where people build software. More than 27 million people use GitHub to discover, fork, and contribute to over 80 million projects.
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React Authentication in Depth – Hacker Noon

React Authentication in Depth:  #React #Reactjs #ReactNative #JavaScript

  • First, let’s go ahead and create our React project using Create React App, and change into the new project’s directory: – create-react-app react-auth – cd react-authNext, let’s install React Router and Glamor using either npm or yarn: – yarn add react-router-dom glamoror – npm i react-router-dom glamor –saveAdding the identity providerYou…
  • Next we’ll add user-signin (Amazon Cognito) and deploy the new configuration: – awsmobile user-signin enable – awsmobile pushawsmobile user-signin enable will enable Amazon Cognito in our project with default settings, including 2 factor authentication with SMS (we will add TOTP later).
  • If you would like more control over how your authentication provider is created, you can either pass the -p flag to specify a more detailed configuration (awsmobile user-signin enable -p), or you can go to Amazon Cognito to directly create and configure the service in the console.To see a more…
  • : 2 factor authentication for new user sign up – confirmSignUp(username: string, authenticationCode: string) – signIn — signs in an existing user – signIn(username: string, password: 2 factor authentication for user sign in – confirmSignIn(user: object, authenticationCode: string) – Now, let’s wire this up!
  • When the user signs up using the signUp method, they will receive an authorization code via SMS, and will need to input this value into the form and we will then confirm that this code is correct by calling confirmSignUp: – – Let’s now create the inputs, buttons, and the…

How to do implement world 2 factor authentication (both SMS and TOTP) using React, React Router, and Amazon Cognito In this post, we’ll walk through how to implement real world user sign up and sign…
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How to build a GitHub bot with PhantomJS, React, and Serverless framework

  • How to build a GitHub bot with PhantomJS, React, and Serverless frameworkThis tutorial is about building a simple Serverless bot that returns a chart with top GitHub repository contributors for a selected period.
  • To retrieve top repository contributors, we will use GitHub stats API, the amazing Nivo to display data, Storybook to check how our chart looks and feels, PhantomJS to turn HTML into an image, and Serverless framework to interact with AWS.
  • The only difference is an additional permission to invoke lambda: – iamRoleStatements: [ Effect: ‘Allow’, – Action: [‘lambda:InvokeFunction’], – Resource: [‘*’] – }]Setting up the Slack botThe last step will be to create a service that will handle message events for the bot.
  • npm install -g serverless – npm install -g servicelessCopy the GitHub and Slack bot tokens, and set them to GITHUB_TOKEN and SLACK_TOKEN environment variables accordingly.
  • At the end you should see a similar output: – Deployment completed successfuly[app/html-to-png] [completed]: – Service Information – service: html-to-png – stage: dev – region: us-east-1 – stack: html-to-png-dev – api keys: – None – endpoints: – None – functions: – renderToPng: Removing old service versions… – [app/slack] [completed]: -…

This tutorial is about building a simple Serverless bot that returns a chart with top GitHub repository contributors for a selected period. It is relevant to those who have some experience with…
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