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 App() {
	return (
  	<Dad>
  	  <Kid num={1} visible={true} />
  	</Dad>
  );
}

function Dad({ children, visible }) {
	console.log('dad');
  if (!visible) return null;
	return (
  	<div>
  	  { children }
  	</div>
  );
}

function Kid({ num, visible }) {
	console.log('kid');
	return (
  	<div>
      kid { num }
    </div>
  );
}

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