React Basic Hooks - useEffects sample

by kpulkit29

HTML

<div id="root"></div>
<div id="other-div"></div>

CSS

body {
  height: 100vh;
  width: 100%;
  font-family: 'Open Sans', sans-serif;
  font-weight: bold;
  font-size: 24px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: center;
}

#root, #other-div {
  width: 100%;
}

button {
  padding: 10px 20px;
  border: none;
  border-radius: 6px;
  background-color: teal;
  color: white;
  margin: 50px;
  font-weight: bold;
  font-size: 1rem;
}

React

const {useState, useEffect} = React;

function Test() {
  const [state, setState] = useState(0);
  useEffect(() => {
    console.log('state updated', state);
  }, [state]);
  function handle() {
    for (let i = 0; i < 100; i++) {
      setState((prev) => prev + 1);
    }
  }
  return <button onClick={handle}>CLICK</button>
}

ReactDOM.render( <Test />, document.getElementById('root') );