button {
margin: 10px;
}
How to increment and decrement counter in React.js
In this article, we will learn how to create a simple counter in React.js and increment or decrement its value on button click.
class Counter extends React.Component {
constructor(props) {
super(props);
this.state = {
count: 0
};
}
incrementCount = () => {
this.setState({ count: this.state.count + 1 });
}
decrementCount = () => {
this.setState({ count: this.state.count – 1 });
}
render() {
return (
Count: {this.state.count}
);
}
}
ReactDOM.render(
,
document.getElementById(‘app’)
);
