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() {
	const [numTimesEffectRan, setNumTimesEffectRan] = React.useState(0);
  const webApiClient = useWebApiClient();
  
  React.useEffect(() => {
  	setNumTimesEffectRan(numTimesEffectRan + 1);
  }, [!!webApiClient])
  
	return 'Effect ran ' + numTimesEffectRan + ' times';
}

const webApiClientValue = { name: 'client' };

function useWebApiClient() {
	const [webApiClient, setWebApiClient] = React.useState(undefined);
  
  setInterval(() => {
  	setWebApiClient(webApiClientValue);
    console.log('webApiClient', webApiClient);
  }, 1000);
  
  if (webApiClient) return { ...webApiClient };
	return undefined;
}

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