How to NOT React: Common Anti-Patterns and Gotchas in React

Awesome post on #reactjs common problems and solutions

  • Democlass app extends Component { – constructor(props) { – super(props); – this.state = { – name: ” – }; – this.updateValue = this.updateValue.bind(this); – }updateValue(evt) { – this.setState({ – name: evt.target.value – }); – }render() { – return ( – form – input onChange={this.updateValue} value={this.state.name} / – /form – )…
  • Now you can write components like this — – class App extends Component { – constructor(props) { – super(props); – this.state = { – name: ” – };// Look ma!
  • updateValue = (evt) = { – this.setState({ – name: evt.target.value – }); – }render() { – return ( – form – input onChange={this.updateValue} value={this.state.name} / – /form – ) – } – }Read More —2.
  • However, using certain set of values such as array indexes may break your application or render wrong index) = – Display – {…element} – key={index} – / – ) – }ProblemsWhen children have keys, React uses the key to match children in the original tree with children in the subsequent…
  • The docs also mention this — – Because this.props and this.state may be updated asynchronously, you should not rely on their values for calculating the next state.Another problem is when you have multiple setState calls in a single function, as shown above on line 16 and 20.

What is an anti-pattern? Anti-patterns are certain patterns in software development that are considered bad programming practices. The same pattern may have been considered correct at one point in…
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Lifecycle with React’s FunctionComponent

Lifecycle with #ReactJS Function Component

  • I’m thinking about doing something about it and this article is about how to do it.
  • For such reasons, it is often easier for people to use “Stateless FunctionalComponent”, but as a disadvantage in creating applications, “Stateless FunctionalComponent” alone can’t handle “lifecycle”.
  • “hocFactotry” is the name of the function that is the factory of HOC (HigherOrderComponent), W is the React component passed to the argument, and E is the React component of the return value.
  • As the number of components taking this form increases, the class declaration and render become boilerplates.
  • Functions related to life cycle are only a few.

Hello. I’m Sosuke Suzuki of Boostnote maintainer.
Boostnote is written in React.
Boostnote has been passed time since the development, and there are components that are bloated in many places.
Thanks to contributors as well, those components are getting better than before, but they are being Unobtrusive.
I’m thinking about doing something about it and this article is about how to do it.
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Getting Started with React.js

Getting Started with React.js -  #javascript #webdev #reactjs

  • The big advantage of JSX is that it lets you include HTML in your JavaScript files it makes defining React elements easier.
  • A component can be made of one or many React elements.
  • A React component is built up of some or many React elements that are the smallest units of React apps .
  • Tags that start with uppercase (upper camel case) are rendered as React components .
  • It’s recommended using React with Babel that allows you to use the ECMAScript6 syntax and JSX in your React code.

React.js is a flexible and component-based JavaScript library for building interactive user interfaces. It was created and open-sourced by Facebook and is used
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