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…
Continue reading “React’s ⚛️ new Context API – DailyJS – Medium”

React’s ⚛️ new Context API

  • The provider component puts the data into context, and the Higher Order Component pulls the data out of context.
  • The first pull request to that repository is from Andrew Clark (react core team member) and it’s called “New version of context”.
  • , 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 feature” of the framework.
  • One question that I’ve seen a lot about the new context API (or the render prop pattern in general) is how to compose providers and consumers together.

React’s new context API way more ergonomic, it’s no longer “experimental,” and it’s now a first-class API! OH, AND IT USES A RENDER PROP!
Continue reading “React’s ⚛️ new Context API”

React’s ⚛️ new Context API – DailyJS – Medium

React’s ⚛️ new Context API   #reactjs

  • 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…
Continue reading “React’s ⚛️ new Context API – DailyJS – Medium”

React’s ⚛️ new Context API

  • The provider component puts the data into context, and the Higher Order Component pulls the data out of context.
  • The first pull request to that repository is from Andrew Clark (react core team member) and it’s called “New version of context”.
  • , 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 feature” of the framework.
  • One question that I’ve seen a lot about the new context API (or the render prop pattern in general) is how to compose providers and consumers together.

React’s new context API way more ergonomic, it’s no longer “experimental,” and it’s now a first-class API! OH, AND IT USES A RENDER PROP!
Continue reading “React’s ⚛️ new Context API”

React’s ⚛️ new Context API – DailyJS – Medium

  • 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 ) }}class App extends React.Component { render() { ThemeProvider ThemeContext.Consumer…
  • The React team will remove the warning about context being an experimental feature because it’s now a “first-class feature” of the framework.
  • But even when we do feel it, we’ll have a solid, core React API to lean on to help us avoid the problem.Practical ContextOne question that I’ve seen a lot about the new context API (or the render prop pattern in general) is how to compose providers and consumers together….
  • Here’s an example:const ThemeContext = ThemeProvider extends React.Component {/* code */}const ThemeConsumer = ThemeContext.Consumerconst LanguageContext = React.createContext(‘en’)class LanguageProvider extends React.Component {/* code */}const LanguageConsumer = AppProviders({children}) { return ( LanguageProvider ThemeProvider {children} /ThemeProvider /LanguageProvider )}function { return ( LanguageConsumer {language = ( ThemeConsumer {theme = children({language, theme})} /ThemeConsumer )} /LanguageConsumer…
  • react-fns: Browser API’s turned into declarative React components and HoC’s by Jared Palmer 👏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.

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…
Continue reading “React’s ⚛️ new Context API – DailyJS – Medium”

How to use React’s Provider Pattern

How to use React's Provider Pattern  #reactjs #webdev

  • Therefore you could use React’s context to give every component access to the colored theme.
  • That way every component that needs to be styled according to the colored theme could get the necessary information from React’s context object.
  • You have the Provider component that makes properties accessible in React’s context and components that consume the context.
  • This Provider component uses React’s context to pass down the state implicitly.
  • You provide the state to your component as props, the component wraps it into React’s context and all child components can access the state by using a higher order component such as from the react-redux library.

This article gives you a walkthrough for React’s provider pattern. After reading it, you should be able to implement…
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8 things to learn in React before using Redux

8 things to learn in #ReactJS before using #Redux:

  • A component can manage a whole lot of state, pass it down as props to its child components and pass a couple of functions along the way to enable child components to alter the state in the parent component again.
  • Component A is the only component that manages local state but passes it down to its child components as props.
  • In addition, it passes down the necessary functions to enable B and C to alter its own state in A.

    Now, half of the local state of component A is consumed as props by component C but not by component B.

  • When you lift the local state management down to component C, all the necessary props don’t need to traverse down the whole component tree.
  • When a library such as Redux “connects” its state managements layer with React’s view layer, you will often run into a higher order component that takes care of it (connect HOC in react-redux).

Facts about React that should be known before using Redux (or MobX). Most important: Learn React first, then opt-in Redux…
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Higher Order Components in React – CloudBoost

Higher Order Components in React  #higherordercomponents #react #reactjs #javascript #reactjs

  • We must find a way to abstract that repetitive logic in order to avoid going through our codebase every time we want to make a change.What are Higher Order Components?As the name suggests — a Higher Order Component is some special and more important component.
  • If you’ve ever used map, reduce or filter you have already used HOF without even knowing.Similarly to that – Higher Order Components take a component as input and return another component.
  • Some of the more Object Oriented programmers will immediately scream “inheritance”, but have in mind that React favors composition.How do we make a HOC?Let’s start simple and make a HOC that we will use to log the clicks of our users.Here our function takes the component we will be wrapping as an argument and returns a brand new component with all the attached functionality to it.
  • To create our new component we will simply call the function and pass the wrapped one as a parameter.const LogsClicks = else can we do with HOCs?Higher Order Components can be used every time you’ve got repetitive logic in your components.
  • Now when the component mounts and every time it updates, our component will now look at the authenticated property and will redirect to the home page if it’s false.Something to note is that when we’re using the connect helper in order to attach our component to Redux’s store, we are creating another Higher Order Component.

Components are the building blocks of React. We separate our UI into small pieces that are responsible for rendering and managing the state of a particular part of the application. But even though…
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All About React Router 4

  • In some ways, earlier versions of React Router resembled our traditional mental model of what an application router “should be” by placing all the routes rules in one place.
  • Here are some JavaScript concepts you need to be familiar with for this article:

    If you’re the type that prefers jumping right to a working demo, here you go:

    Earlier versions of React Router centralized the routing rules into one place, keeping them separate from layout components.

  • For the first, let’s modify our to accommodate the browsing and profile pages for users and products:

    While this does technically work, taking a closer look at the two user pages starts to reveal the problem:

    New API Concept: is given to any component rendered by .

  • Here’s a different approach which is better:

    Instead of four routes corresponding to each of the user’s and product’s pages, we have two routes for each section’s layout instead.

  • For example, both these console logs will output the same value when the browser path is `/users`:

    ES2015 Concept: is being destructured at the parameter level of the component function.

This post is going to dig into to React Router 4, how it’s so different from previous React Router versions, and why that is. My intentions for this article aren’t to rehash the already well-written documentation for React Router 4. I will cover the most common API concepts, but the real focus is on patterns and strategies that I’ve found to be successful.
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How to use Presentational/Container components in a Redux app – Jakob Lind

I wrote about when and how to use presentational/container components #reactjs #redux

  • Either present something visual (presentational component) OR fetch data (container component).
  • You can use the container/presentational pattern when using both regular Ajax calls inside your components, or when you are using Redux to fetch data.
  • When you start coding your Redux app, you usually start with a wrapper component that receives the data from the Redux store.
  • It is possible to connect Redux to any React component in your application.
  • In a real world application you might need to do more advanced refactorings of the presentational components.

Have you read about Presentational/Container pattern but are still not sure how it looks when it’s used correctly? When should you use it and when should you NOT use it?
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