JAVASCRIPT

react tutorial

As far as I can tell from looking, codecademy, w3schools, 
and many answers on stack overflow are all outdated.

The best option is "https://reactjs.org/"

react tutorial

# React: Setup, Create, and Run :)
1. npm install npx
2. npx create-react-app app-name
3. cd app-name
4. npm start

React js tutorial

npx create-react-app my-app
cd my-app
cd src

# If you're using a Mac or Linux:
rm -f *

# Or, if you're on Windows:
del *

# Then, switch back to the project folder
cd ..

react tutorial

class Board extends React.Component {
  constructor(props) {    super(props);    this.state = {      squares: Array(9).fill(null),    };  }
  renderSquare(i) {
    return <Square value={i} />;
  }

react tutorial

  renderSquare(i) {
    return <Square value={i} />;
  }

react tutorial app

return React.createElement('div', {className: 'shopping-list'},
  React.createElement('h1', /* ... h1 children ... */),
  React.createElement('ul', /* ... ul children ... */)
);

react js tutorial for beginners

class Square extends React.Component {
 render() {
   return (
     <button className="square" onClick={() => console.log('click')}>
       {this.props.value}
     </button>
   );
 }
}

react js tutorial for beginners

class Square extends React.Component {
 render() {
   return (
     <button className="square" onClick={() => console.log('click')}>
       {this.props.value}
     </button>
   );
 }
}