React

by Abdul Ahmad

HTML

<div id="app"></div>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

li {
  margin: 8px 0;
}

h2 {
  font-weight: bold;
  margin-bottom: 15px;
}

.done {
  color: rgba(0, 0, 0, 0.3);
  text-decoration: line-through;
}

input {
  margin-right: 5px;
}

React

function TodoApp() {
	const incrementFetchDataCounter = useDataFetcher();
  
  return (
    <div>
      <button onClick={incrementFetchDataCounter}>
        fetch data again
      </button>
    </div>
  );
}

function useDataFetcher() {
	const [fetchDataCounter, setFetchDataCounter] = React.useState(0);
  
	React.useEffect(() => {
  	console.log('using effect');
  	async function fetchData() {
    	console.log('fetching data');
    	const data = await fetchDataAsync();
    }
    
    fetchData();
  }, [fetchDataCounter]);
  
  return () => setFetchDataCounter(fetchDataCounter + 1);
}

function fetchDataAsync() {
	return Promise.resolve('data');
}

ReactDOM.render(<TodoApp />, document.querySelector("#app"))