React.JS — Component Data Transfer – codeburst

  • If you are passing data from somewhere in a component, to somewhere else inside the same component, this can be done through state.So what is state?The heart of every React component is its “state”, an object that determines how that component renders behaves.
  • That might look something like this:class component_A extends Component { constructor() { super(); this.state = { data: [], };}In this case, we are defining the state of data.
  • Passing data from parent to child components is only slightly trickier, in that, we can’t pass data in an unbroken chain to other components.
  • [callback] in the child, and pass in the data as an argument.From our above example, our code might look something like this:class component_A extends Component { constructor() { super(); this.state = { listDataFromComponent_C: “ “, };}myCallback = (dataFromComponent_C) = {this.setState({ dataFromComponent_C: dataFromComponent_C});Now from within the child component (component_C) we can pass something to props are static, while state can be changed, once you have passed data from a child to a parent, or from parent to a child, you may need to interact with it differently within that new component.
  • It might look like the following:class component_A extends Component {constructor = {dataFromComponent_C: “ “};},myCallback = (dataFromComponent_C) = {this.setState({ dataFromComponent_C: dataFromComponentC });This is just a brief explanation of how to change data within a component, and transfer data to other child and parent components.

In React JS, there’s often a need to pass data from one component to another. If you are passing data from somewhere in a component, to somewhere else inside the same component, this can be done…
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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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Share Code between React and React Native Apps – Hacker Noon

  • Share Code between React and React Native AppsDevelopers are adopting Higher Order Components (HOC) Stateless Functional Components, and for good reason: they make it easier to achieve code reuse, a coveted aspiration of developers.There are many articles on HOC and Functional Stateless Components.
  • But here are a few benefits to consider:UX consistency, both within an application and across devicesMake cross-cutting upgrades: improve a component and update all its uses easilyreuse routing and authorization rulesSwitch libraries (for example, the apps below uses MobX for state management, but Redux could be swapped in)I’ll focus on using HOC and Functional Stateless Components to achieve reuse.
  • It will not use routes nor multiple scenes as the focus is on component reuse.We will add a second pair of applications (React and React Native), which will reuse the components we extract.This GitHub repo branch has the baseline applications (The final result is here.)
  • You have to “see” the duplication, which might require rearranging code blocks.Applying these ideas is like moving puzzle pieces around, to find where they meet and what patterns they reveal.Let’s start by looking for duplication.Seeing DuplicationThe web and mobile applications have two main components.In the web application, App.jsIn the mobile application, SearchView.jsThe following outlines their structure.Almost the same, but the platform differences between React and React Native are in the way.The two components have similar structures.
  • But they are in the README for the GitHub repo branch.Instead, I’ll focus on the refactoring to a common SearchBox, which our web (React) and mobile (React Native) applications will both use.Extracting a Shared Component for Web and MobileFor clarity, I’ve renamed SearchInput.js, SearchResults.js and SearchBox.js to WebSearchInput.js, WebSearchResults.js and WebSearchBox.js, respectively.Let’s look at (Web)SearchBox.jsLines 2–10, 19, 20, 26, 27 are specific to React.MuiThemeProvider, a container for Material UI components, is the only direct dependency on Material UI.

Developers are adopting Higher Order Components (HOC) Stateless Functional Components, and for good reason: they make it easier to achieve code reuse, a coveted aspiration of developers. There are…
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Creating your first React component – Paritosh Pundir – Medium

Creating your first React component  #javascript #es6 #programming #react #reactjs

  • If you already understand how the setup process works continue reading, otherwise check this post: Quick guide to starting with React js using ES6Here is the code on our main react file, where we will call our first component.Code on Github to follow alongmain.jsxNow lets create a new folder Component and than create FirstComponent.jsx inside it.
  • js go ahead and use it, things will work the same way.In this file we will first import React and Component from react to use it for creating our first react component.import React, {Component} from ‘react’;With react and component ready for use, now go ahead and create a simple ES6 class as follows:class FirstComponent {}At the moment this is an ES6 class but not a react component, so lets extend it to make it a react component:class FirstComponent extends Component {}Now we have a react component but it is of no use.
  • React components has a function called render() which generates the view of our page.
  • Lets go ahead and create one h1 element that our component will render:class FirstComponent extends Component { render() { return ( h1I am the First Component/h1 ); }}We are almost done, but still we need to export this class.
  • So the final code looks like this:Now lets use this component in our main.jsx, just import it from the path and use it as you would use a HTML tag (don’t forget to close it with / ).

In a recent post we learnt how to get started with react and setting up webpack and react modules. If you already understand how the setup process works continue reading, otherwise check this post…
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intro-to-react/README.md at master · ericvicenti/intro-to-react · GitHub

  • We can modify our component to display the data being passed in:

    Near the top of the file, lets add some different places that we might want to display weather for:

    Now, upgrade the App’s render function to iterate over each place, and render a tag for it.

  • We want our app to be able to switch between places, so we can use state to keep that data in our App component.
  • Let’s use the and in our App component:

    At this point, your file should look like this.

  • Let’s install it, alongside which provides the React components for it:

    In the top of the app file, import the css from the bootstrap module:

    Next, import the components we want to use from .

  • Now, replace the App component’s render function to use the bootstrap components:

    Now our app is starting to look more polished, but it would be nice to have a custom theme.

intro-to-react – A Hands-On Walkthrough of your first React Web App
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Why The Hipsters Recompose Everything – JavaScript Inside – Medium

Why the hipsters recompose everything:  #ReactJS

  • It’s important to note that these functions are catered towards function components but should work for class components none the less.
  • High order components are functions that expect a component and return a new component.
  • After creating the factory we return a new function which applies the mapping function with the passed in props.
  • mapProps expects a mapping function which returns a new function that itself awaits a component.
  • const enhance = mapProps(props => omit ([‘foo’] , props))

Building a Utility Library for React
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Release v2.27.0 · ProjectSeptemberInc/gl-react-native · GitHub

  • import React , { Component } from ” react ” ; import { View , Animated } from ” react-native ” ; import { Surface } from ” gl-react-native ” ; import GL from ” gl-react ” ; const stateForTime = t => ({ colors : [ [ Math .
  • import React , { Component } from ” react ” ; import { View , Animated } from ” react-native ” ; import { AnimatedSurface } from ” gl-react-native ” ; import GL from ” gl-react ” ; export default class AnimatedExample extends Component { state = { heightValue : new Animated.
  • Node uniforms = {{ colors, particles, }} shader = {{ // inline example frag : ` precision highp float; varying vec2 uv; uniform vec4 colors[3]; uniform vec2 particles[3]; // N.B. don’t abuse these technique.
  • cos ( 1 + 0.003 * t), 1 ] ], particles : [ [ 0.3 , 0.3 ], [ 0.7 , 0.5 ], [ 0.4 , 0.9 ] ] }); export default class AnimatedExample extends Component { state = stateForTime ( 0 ); componentWillMount () { const begin = Date .
  • interval ); } render () { const { colors , particles } = this .

Read the full article, click here.


@greweb: “gl-react-native 2.27.0 featuring Array uniforms, AnimatedSurface, big triangle optim”


gl-react-native – OpenGL bindings for React Native to implement complex effects over images and components, in the descriptive VDOM paradigm


Release v2.27.0 · ProjectSeptemberInc/gl-react-native · GitHub