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 buttonClickHandler = React.useCallback(async () => {
  	const res = await somethingAsync();
    console.log('res: ', res);
  });
  
  return (
    <div>
      <button onClick={buttonClickHandler}>
        click
      </button>
    </div>
  );
}

function somethingAsync() {
	return new Promise((resolve, reject) => {
  	setTimeout(() => {
    	resolve('howdy');
    }, 1000);
  });
}

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