Clock in react

clock-in-react.markdown

Clock in react

A Pen by Usman Ahmad on CodePen.

License.

index.html

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

script.babel

class Clock extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      date: new Date()
    };
  }
  tick() {
    this.setState({date: new Date()});
  }
  componentDidMount() {
    this.timer = setInterval(
      () => this.tick(),
      1000
    );
  }
  componentWillUnmount() {
    clearInterval(this.timer);
  }
  render() {
    return (
      <p>Today is {this.state.date.toLocaleTimeString()}</p>
    );
  }
}

ReactDOM.render(<Clock />, document.querySelector('#app'));

scripts

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.8.4/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.8.4/umd/react-dom.production.min.js"></script>

todo-app.markdown

ToDo App

A Pen by Usman Ahmad on CodePen.

License.