import React, { Component } from 'react';

class MyTimer extends Component {

constructor(props) {
super(props);
this.state ={
timer : 0,
};
}

componentDidMount() {
window.setInterval(() => {
let counter = this.state.timer;
counter++;
this.setState({
timer: counter,
});
}
,1000);
}

componentDidUpdate() {
console.log(`un update a eu lieu vers ${this.state.timer}`);
}


render() {
return (
<div>
{this.state.timer}
</div>
);
}
}

export default MyTimer;