jsalonen/class-component-with-lifecycle.js

## class-component-with-lifecycle.js
class Clock extends Component {
  componentDidMount() {
    this.clockIntervalId = window.setInterval(() => {
      console.log('tick');
    }, 1000)
  }

  componentWillUnmount() {
    window.clearInterval(this.clockIntervalId);
  }

  render() {
    return (
      <p>Clock is ticking...</p>
    );
  }
}
	class Clock extends Component {
	componentDidMount() {
	this.clockIntervalId = window.setInterval(() => {
	console.log('tick');
	}, 1000)
	}

	componentWillUnmount() {
	window.clearInterval(this.clockIntervalId);
	}

	render() {
	return (
	<p>Clock is ticking...</p>
	);
	}
	}